Snowflake Obsidian — Properties, Meaning, and Uses

Snowflake obsidian is a rhyolitic volcanic glass distinguished by its white patches or spherulites of cristobalite on a completely black background. It forms when acidic lava (with high SiO₂ content) cools so rapidly that there isn't enough time for ordered mineral crystallization, producing an amorphous natural glass. With a hardness of 5–5.5 Mohs, it is more fragile than quartz but allows for a high-quality polish that enhances the black-white contrast. Property Value Mineralogical name Snowflake Obsidian Chemical formula Amorphous SiO₂ (volcanic glass) with crystalline SiO₂ spherulites (cristobalite) Mineral group Mineraloids — volcanic glasses Crystal system Amorphous (no crystal structure) Hardness (Mohs) 5–5.5 Density 2.35–2.60 g/cm³ Luster Vitreous Fracture Conchoidal (very sharp edges) Color Black with white cristobalite patches Streak White Diaphaneity Opaque Main deposits USA (Utah, Colorado, Oregon), Mexico, Ecuador, Scotland What is Snowflake Obsidian? Obsidian is a mineraloid—not technically a mineral because it lacks a crystalline structure—formed by the rapid solidification of silica-rich acidic magma (70–75% SiO₂). Snowflake obsidian, in particular, contains cristobalite spherulites: small spherical or snowflake-shaped nodules where silica, during subsequent slow cooling, partially crystallized into a metastable polymorph of quartz. The popular name "snowflake obsidian" describes the visual appearance of the white spherulites against the black glass, evoking snowflakes. The Spanish name "obsidiana nevada" directly translates that image. Mineralogically, spherulites are radial groupings of microcrystalline cristobalite, and their size varies from less than 1 mm to over 3 cm in exceptional specimens. Physical and chemical properties Composition and structure Snowflake obsidian is amorphous SiO₂ (glass) with between 1% and 5% crystalline cristobalite inclusions. The black background is due to magnetite inclusions or the selective absorption of light in the glass by its iron and other transition metal content. The absence of a crystalline structure means its conchoidal fracture produces sharper edges than any polished metal—obsidian tools were the scalpels of prehistory. Hardness, toughness, and durability With a hardness of 5–5.5 Mohs, snowflake obsidian is softer than quartz and requires more care in high-wear jewelry. Its biggest limitation is fragility: although it is very hard to scratch with soft metals, it can chip with a sharp blow. Without defined cleavage, the clean conchoidal fracture facilitates carving but produces very sharp edges that require caution during the process. Optical properties High-quality vitreous luster on the polished surface. The refractive index is ~1.48–1.51, lower than that of quartz (1.54–1.55), consistent with its amorphous nature. The optical contrast between the black glass and the white spherulites is the defining characteristic of this variety. Other properties Obsidian is not fluorescent under UV light. The magnetite content can produce a weak magnetic response in some specimens. Lacking a crystalline structure, it is not piezoelectric. It dissolves in concentrated hydrofluoric acid (like all silicates) but is stable against household acids. Related varieties of obsidian Snowflake obsidian is part of the obsidian family, which includes several varieties distinguished by their inclusions: Black Obsidian: pure volcanic glass with no visible spherulites, completely black. Mahogany Obsidian: black background with reddish or brownish areas due to hematite inclusions. Rainbow Obsidian: iridescence phenomenon due to internal nano-layers that diffract light. Silver Sheen Obsidian: silvery luster due to nano-gas bubbles distributed in layers. Where is snowflake obsidian found? The most important snowflake obsidian deposits are in the western United States. Utah (Millard County, Beaver County) and Colorado have extensive, well-documented outcrops. Oregon also produces lapidary-quality snowflake obsidian. Mexico, in the state of Jalisco and other volcanic states along the Trans-Mexican Volcanic Belt, has historical deposits exploited since before the arrival of the Spanish. Ecuador and other Andean volcanic areas provide specimens with larger spherulites. In Scotland (Isle of Arran), there is a historical obsidian outcrop with spherulites that was locally traded in the 19th century. Iceland, Turkey (Cappadocia), and Ethiopia also have obsidian deposits, although not always with the characteristic snowflake variety. Formation: Snowflake obsidian forms when rhyolitic lava flows cool rapidly on the exterior of the flow (black background), and subsequently, during slow geological annealing within the flow, some of the amorphous silica partially crystallizes into cristobalite (white spherulites). Uses of snowflake obsidian In jewelry and lapidary The visual contrast between intense black and white spherulites makes snowflake obsidian one of the most recognizable lapidary materials. It is mainly worked as cabochons in earrings, pendants, and rings. The recommended closed bezel setting in 925 silver is particularly effective because the silver metal harmonizes with the white of the spherulites and the black of the glass. The relative fragility of obsidian (hardness 5–5.5) makes setting a critical step: a poorly fitted bezel can create tensions that produce micro-fissures in the glass. At Anima Mundi Crystals, we work with snowflake obsidian with special attention to the setting process to ensure the integrity of each piece. You can see the selection in the cabochons and pendants collections. Prehistoric and archaeological uses Obsidian—in all its varieties—was the primary cutting tool material of the Paleolithic and Neolithic eras in all cultures with access to volcanic outcrops. Mesoamerican obsidian (Mexico, Guatemala) was extensively traded over long distances in Aztec and Mayan cultures, where it was also used in ritual mirrors for divination. Geochemical provenance analysis of archaeological obsidian pieces has allowed the reconstruction of prehistoric trade routes spanning thousands of kilometers. In decoration and collecting Specimens of snowflake obsidian with large and uniformly distributed spherulites are prized collector's items. Spheres, palmstones, and pyramids of snowflake obsidian are common decorations due to the visual impact of the black-white contrast. Snowflake obsidian in cultural and spiritual tradition The properties described in this section belong to the cultural tradition of crystal healing and do not constitute medical advice. History and ancestral uses Obsidian in general played a central role in Mesoamerican cultures. The Aztecs (Mexica) called black obsidian itztli and considered it sacred to Tezcatlipoca, god of the night sky and the smoking mirror. Polished black obsidian mirrors were used in divination rituals. The snowflake variety was not specifically distinguished in Mesoamerican sources, but it was used in jewelry and ritual ornaments. In Native American cultures of the southwestern United States, snowflake obsidian was used ritually and ornamentally from at least the Archaic period (8000–1000 BC). The Ancestral Puebloans (Anasazi) traded obsidian from deposits in Utah and Oregon. Meaning in different cultures In contemporary Western crystal healing, the black-white duality of snowflake obsidian is symbolically interpreted as the balance between shadow and light, chaos and order. This interpretation is recent—19th and 20th centuries—and does not correspond to documented traditional use of this specific variety. Attributed properties in crystal healing Crystal healing associates snowflake obsidian with introspection, the acceptance of duality, and the ability to find calm in uncertainty. Naisha Ahsian, in The Book of Stones, describes it as a stone that promotes present moment awareness. It is used in meditations focused on the balance between thought and action. Chakras and associations Aspect Value Chakra Root (Muladhara) / Third Eye (Ajna) Element Earth / Fire Planet Saturn / Pluto Zodiac sign Capricorn, Scorpio How to identify authentic snowflake obsidian Basic tests Authentic snowflake obsidian has a high-quality vitreous luster, three-dimensional white spherulites (not painted on the surface), a cold temperature to the touch, and a white streak on porcelain. When broken, it produces extremely sharp edges with a conchoidal fracture. Its density (~2.4–2.5 g/cm³) is clearly higher than that of plastic. Common confusions Black plastic with white spots: no vitreous luster, scratches with a fingernail, warmer to the touch, and much lighter. Black-white art glass: white spots are irregularly integrated into the glass (not spherical in shape), the fracture is less conchoidal, and geological provenance cannot be verified. Black obsidian with white paint: paint comes off with a fingernail, not integrated into the mass. At Anima Mundi Crystals, we verify the volcanic nature of each batch by the characteristic spherical shape of the spherulites and the clean conchoidal fracture. Care and maintenance of snowflake obsidian Cleaning Lukewarm water with neutral soap and a very soft cloth. Obsidian is fragile: avoid bumps and lateral pressure on the piece. Avoid ultrasonic cleaners. Dry completely before storing. Consult our jewelry care guide for more details on handling fragile stones. Storage and precautions Store in a cloth bag or separated from other jewelry to avoid bumps. Despite its vitreous luster, obsidian has a hardness of 5–5.5 and can be scratched by quartz (7) or even hard metal objects. Avoid sudden temperature changes (thermal shock), which can cause microfractures in the glass. Snowflake obsidian at Anima Mundi Crystals We incorporate snowflake obsidian mainly into free-form cabochons and pendant pieces, selected for the quality and uniformity of the black-white contrast. We work with it with special attention to the setting process to ensure the integrity of the glass. You can see the selection in the cabochons and all jewelry collections. Frequently asked questions about snowflake obsidian What is snowflake obsidian? Snowflake obsidian is a natural volcanic glass (mineraloid, not a mineral) that is black with white patches of cristobalite—a polymorph of quartz that partially crystallized during the slow cooling of lava. Its name describes the appearance of snowflakes on a black background. It has a hardness of 5–5.5 Mohs and a very sharp conchoidal fracture. What is the difference between snowflake obsidian and black obsidian? Black obsidian is a completely black volcanic glass with no visible inclusions. Snowflake obsidian has white cristobalite spherulites that formed during a subsequent geological annealing after the initial cooling of the lava. Both are amorphous SiO₂, but in snowflake obsidian, some of the silica partially crystallized. Can snowflake obsidian be used in everyday jewelry? With caution. Its hardness of 5–5.5 Mohs makes it more vulnerable to scratches than quartz. It is suitable for regular use earrings and pendants, but in rings, it is more vulnerable to lateral impacts. The recommended closed bezel setting in 925 silver protects the edges. Avoid direct impacts. How is snowflake obsidian cleaned? Lukewarm water with neutral soap and a very soft cloth. Obsidian is a glass and can crack with ultrasonic cleaners or sudden temperature changes. Dry thoroughly before storing. It is not sensitive to household acids, but it is to thermal shock and impacts. Where is snowflake obsidian mined? The main deposits are in the western United States (Utah, Colorado, Oregon) and Mexico (Jalisco and the Trans-Mexican Volcanic Belt). There is also production in Ecuador, Scotland (Isle of Arran), and Iceland. It forms in rhyolitic lava flows with initial rapid cooling followed by partial geological annealing. What does snowflake obsidian symbolize in crystal healing? Crystal healing tradition associates snowflake obsidian with inner balance, acceptance of duality, and calm in uncertainty. The black-white visual contrast is interpreted as a symbol of integrating opposites. It is linked to the root chakra and the third eye, the planet Saturn, and the signs Capricorn and Scorpio. Why does snowflake obsidian have white spots? The white spots are cristobalite spherulites, a high-temperature polymorph of quartz. They form when obsidian, already solidified, remains at an elevated temperature for a sufficiently long geological period for some of the amorphous silica to recrystallize into radial spherical structures of microcrystalline cristobalite. Recommended bibliography Gienger, Michael. Crystal Power, Crystal Healing. Cassell Illustrated, 1998. Simmons, Robert; Ahsian, Naisha. The Book of Stones. North Atlantic Books, 2005. Hall, Judy. La Biblia de los Cristales. Gaia Ediciones, 2003. Mindat.org — Obsidian / Snowflake Obsidian: mindat.org Gemological Institute of America (GIA): resources on obsidian and volcanic glass.

Snowflake Obsidian — Properties, Meaning, and Uses

Anima Mundi CrystalsJun 21, 2026

Information

Property	Value
Mineralogical name	Snowflake Obsidian
Chemical formula	Amorphous SiO₂ (volcanic glass) with crystalline SiO₂ spherulites (cristobalite)
Mineral group	Mineraloids — volcanic glasses
Crystal system	Amorphous (no crystal structure)
Hardness (Mohs)	5–5.5
Density	2.35–2.60 g/cm³
Luster	Vitreous
Fracture	Conchoidal (very sharp edges)
Color	Black with white cristobalite patches
Streak	White
Diaphaneity	Opaque
Main deposits	USA (Utah, Colorado, Oregon), Mexico, Ecuador, Scotland