Howlite — Properties, Meaning, and Uses

Howlite (Ca₂B₅SiO₉(OH)₅) is a calcium borosilicate with a monoclinic crystal system, white color with gray veins, and a hardness of 3.5 Mohs, soft enough to be easily dyed. It was first described in 1868 in Nova Scotia, Canada, and the largest deposits are located in California (USA). Much of the inexpensive "turquoise" on the market is actually howlite dyed blue, visually indistinguishable from authentic turquoise.

Property	Value
Mineralogical Name	Howlite
Chemical Formula	Ca₂B₅SiO₉(OH)₅
Mineral Group	Borates (calcium borosilicate)
Crystal System	Monoclinic; rarely in crystals, usually nodular-massive
Hardness (Mohs)	3.5
Density	2.53—2.59 g/cm³
Luster	Sub-vitreous to porcelaneous
Fracture	Conchoidal to irregular
Color	White to cream with gray or black veins
Streak	White
Diaphaneity	Opaque
Fluorescence	Fluorescent under longwave UV (yellow-brown or blue-white)
Common Treatments	Dyeing (blue, green, red, black)
Main Deposits	Canada (Nova Scotia), USA (California, Nevada), Mexico, Turkey

What is howlite?

Howlite is a mineral from the borate group, discovered in 1868 by Henry How, a Canadian chemist and mineralogist, in a gypsum mine in Nova Scotia. The miners who found it considered it a nuisance: it was harder than the surrounding gypsum and made extraction difficult. How formally described it and the mineral was named in his honor.

In nature, it almost always occurs in irregular, cauliflower-like nodules, rarely in well-defined tabular crystals. It is part of evaporitic deposits—environments where water evaporates, leaving precipitated salts and minerals—along with boracite, ulexite, and colemanite. The fibrous or porcelaneous texture of the nodular mass is characteristic and helps to identify it.

Its trade name is sometimes spelled "howlite" (English) or "howlita" (Spanish); in some markets, it is sold under false names such as "white turquoise" (which does not exist) or "white buffalo stone."

Physical and chemical properties

Composition and crystal structure

The formula Ca₂B₅SiO₉(OH)₅ reflects the combination of calcium, boron, and silicon in a monoclinic structure. Boron is the differentiating element: it unequivocally places it in the borate group and explains some of its unusual optical properties. In massive aggregates, the fibrous structure is visible with a 10x magnifier as small, intertwined bundles.

Hardness, tenacity, and durability

With 3.5 Mohs, howlite is a soft stone that is easily scratched with a coin or a knife. This low hardness, combined with its high porosity, makes it very susceptible to absorbing dyes, oils, and dirt. For daily wear jewelry in rings or bracelets, it should be protected from continuous friction and chemicals (creams, perfumes, detergents).

Optical properties

The sub-vitreous to porcelaneous luster is characteristic. Opacity is total in the vast majority of specimens. Under longwave UV light, it exhibits fluorescence, usually in yellow-brown or blue-white tones, a useful feature for identifying it against resin imitations. The network of gray or black veins running through the white mass is due to manganese oxide inclusions.

Other properties

Porosity is the most relevant property for the market: howlite absorbs dyes easily and uniformly. Turquoise blue dyeing is the most common, but it is also sold in green, coral red (as an imitation of coral), black, and other colors. The dye penetrates several millimeters, making it difficult to detect with the naked eye in polished pieces.

Where is howlite found?

The most important deposits are concentrated in North America:

• Canada (Nova Scotia) — type locality; classic nodules come from here.
• USA (California, Nevada) — active deposits; California produces good lapidary quality material.
• Mexico — deposits in northern states, often associated with ulexite deposits.
• Turkey — lower quality material, though abundant.
• Serbia — more recent deposits with some extraction activity.

Howlite does not appear in the Iberian Peninsula with mineralogical relevance, although it can be found marginally in evaporitic environments in southeastern Spain.

Uses of howlite

In jewelry and lapidary

Howlite is usually worked into cabochons and beads for necklaces and bracelets. Its softness facilitates carving, but also makes it more susceptible to wear. Blue-dyed pieces are the best-selling in popular jewelry, often presented—erroneously—as turquoise. Natural white howlite has its own lapidary appeal, especially in large pieces where the vein pattern is pronounced.

In our collection of rough minerals you can find howlite specimens labeled with their correct name. For set pieces, wire wrapping or macramé setting is particularly suitable due to the softness of the stone, which avoids excessive metal pressure. Also check out all our jewelry with selected natural gems.

In industry

Howlite has no significant industrial uses. Its boron content has led to studies of its potential as a source of this element, but ulexite and colemanite deposits are much more abundant and profitable for this purpose.

In decoration and collecting

Large nodules with well-defined veins are appreciated decorative pieces. Tabular crystals—extremely rare—are sought after by mineralogical collectors specializing in borates. For collecting, specimens from the type locality (Nova Scotia) have additional historical and scientific value.

Howlite 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

Howlite is a recently discovered mineral (1868) and has no documented history of ancestral use. Unlike gems such as garnet or lapis lazuli, it does not appear in historical texts or archaeological contexts. Its spiritual and energetic use is entirely contemporary, developed mainly in the second half of the 20th century within the tradition of Western crystal healing.

Meaning in different cultures

As a mineral without a history of ancient cultural use, its symbolism is a recent construct. In the context of contemporary crystal healing, the white color of howlite is associated with purity, mental clarity, and calm. Some traditions link it to patience and honest communication.

Attributed properties in crystal healing

In the crystal healing tradition, howlite is mainly used as a stone for calming and reducing mental tension. It is associated with the ability to slow down racing thoughts and promote restful sleep. On an emotional level, it is used to support anger and impatience management processes, promoting more thoughtful responses.

Different schools also use it to facilitate concentration during meditation, with the idea that its porous texture and neutral color help to "empty" the mind of superfluous content.

Chakras and associations

Aspect	Association
Main Chakra	Sahasrara (crown chakra)
Secondary Chakra	Vishuddha (throat chakra)
Element	Air
Planet	Moon
Zodiac Signs	Gemini, Virgo

How to identify authentic howlite

Basic tests

Natural howlite is white with gray or black veins, and its surface, even polished, has a slightly matte or porcelaneous appearance. The most revealing test to detect howlite dyed turquoise is to use acetone: applied with a cotton swab, it dissolves or lightens the artificial dye in a few seconds without affecting genuine turquoise. UV fluorescence (yellow-brown) also distinguishes howlite from other white stones such as magnesite or marble.

Common confusions

The four most common confusions in the market:

• Dyed turquoise (blue howlite) — the acetone test exposes it. Authentic turquoise has a higher density (2.6—2.9 g/cm³) and a different vein pattern.
• Magnesite — also white with veins, but with lower density (2.9—3.1 g/cm³) and a more angular vein pattern.
• Calcite — softer (3 Mohs), reacts with dilute hydrochloric acid, producing bubbles; howlite does not.
• Plastic or resin — much lighter, neutral surface temperature (does not feel cold to the touch like howlite).

at Anima Mundi Crystals, we identify and correctly label each piece before adding it to stock, always differentiating between natural howlite and dyed howlite.

Care and maintenance

Cleaning

Clean howlite only with a soft damp cloth. Avoid soaps, detergents, or any chemical products, as they easily penetrate the pores and can alter the color—both in natural and dyed pieces. Prolonged water exposure can also affect the dye in colored pieces. Never use ultrasonics or steam.

Storage and precautions

Store it separately from other stones: its low hardness (3.5 Mohs) makes it vulnerable to scratches from almost any other gem. Avoid direct contact with creams, perfumes, and essential oils. For daily wear bracelets and rings, it is preferable to remove them for sleeping, showering, or manual tasks. Consult our jewelry care guide for more information.

Howlite at Anima Mundi Crystals

We work with howlite, always differentiating natural material from dyed material and labeling each piece transparently. Available specimens include rough nodules and polished cabochons in natural color. You can see the selection in rough minerals and cabochons.

Frequently asked questions about howlite

Is blue howlite natural?

No. There is no natural blue howlite. Howlite is white with gray veins in its natural state. The blue color is always the result of artificial dyeing. This dyed version is often sold as turquoise, which is misleading. Authentic turquoise has a completely different chemical composition (copper and aluminum phosphate).

How do I know if I have dyed howlite?

The simplest test is to apply acetone with a cotton swab to an inconspicuous area: if the cotton comes away with blue or green color, the stone is dyed. Genuine turquoise does not react to acetone in this way. You can also look for the fracture area or the inside of bead holes: in dyed howlite, the interior is usually white or lighter than the surface.

How long does dyed howlite last?

The dye in dyed howlite is not permanent. Over time, contact with skin, sweat, and cosmetic products can fade the surface. Discoloration is faster in bracelets and rings than in pendants. With proper care (avoiding water and chemicals), the dye can last several years before visible degradation occurs.

Can howlite be used in water?

It is not recommended. Howlite's high porosity means it absorbs water easily, which can affect both the natural color and the dye. Prolonged exposure to water can also weaken the mineral's structure in delicate pieces. In crystal healing tradition, it is usually recommended to clean it with smoke (smudging) or moonlight instead of water.

What is the difference between howlite and magnesite?

Both are white with dark veins and are sometimes sold under incorrect names. Magnesite is a heavier carbonate (MgCO₃) (density 2.9—3.1 g/cm³ compared to 2.53—2.59 for howlite) and reacts with dilute hydrochloric acid, producing bubbles. Howlite does not react to acid. The vein pattern in magnesite tends to be more angular and abrupt.

What is howlite used for in meditation?

In crystal healing practice, howlite is used to help calm internal dialogue during meditation. Its neutral white color and matte texture are considered visually non-stimulating, facilitating states of tranquil attention. It is usually placed on the crown chakra or held in the hands during practice.

Recommended bibliography

• Gienger, M. — Crystal Power, Crystal Healing (1998). Blandford.
• Simmons, R. & Ahsian, N. — The Book of Stones (2005). Heaven & Earth Publishing.
• Hall, J. — The Crystal Bible (2003). Gaia Ediciones.
• Mindat.org — Howlite
• Wikipedia — Howlita
• Handbook of Mineralogy — Howlite PDF