Small prehnite cabochons in semi-translucent apple green. Seven formats between 11 and 15 mm: round, oval, and drop. Flat back. Selected at a wholesale lapidary market.
Item Details
| Mineral |
Prehnite (calcium aluminum inosilicate) |
| Dimensions |
Nr.1: Ø12×7 · Nr.2: Ø11×7 · Nr.3: 14×10×7 · Nr.4: Ø12×7 · Nr.5: 15×10×6 · Nr.6: 13×10×6 · Nr.7: 11×10×4 mm |
| Shape and back |
Round, oval, or drop depending on variant; polished flat back |
| Finish |
Mirror polished |
| Hardness |
6-6.5 Mohs — suitable for earrings, pendants, and rings with moderate use |
| Origin |
Material acquired at wholesale lapidary market |
| Treatment |
Untreated |
| Item type |
Unique piece per variant |
This specific piece
Prehnite displays a characteristic translucence: it is not completely transparent, but filters light with a milky veil that gives it inner depth. The green is soft, like a new leaf or a green apple — never the intense green of malachite or the dark green of emerald. In small pieces like these, the translucence is especially noticeable when set in an open bezel, allowing light to pass through the cabochon.
The seven formats range from the smallest round (Ø11 mm) to the 15×10 mm drop. Each piece is slightly different in translucence and tone, depending on the point of origin of the fragment from the deposit.
How prehnite is formed
Prehnite crystallizes in cavities of volcanic and low-grade metamorphic rocks, associated with zeolites and epidote. It forms between 200-400 °C from calcium and aluminum-rich fluids. Its double-chain inosilicate structure gives it the translucence that distinguishes it from green feldspars (aventurine) and chrysoprase (green chalcedony).
What mounting works for
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Delicate 925 silver earrings — the small size (11-13 mm) is ideal for stud or light drop earrings; the soft green does not compete with other design elements.
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Stacking rings — one or several together create a subtle mineral garden effect.
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Minimalist pendants — the translucence makes the cabochon change appearance with ambient light.
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Wire wrap — an alternative for those working with wire wrapping; oval and drop formats are especially comfortable to wrap.
Prehnite in tradition
Prehnite was the first mineral scientifically described with a person's name: it was named in honor of the Dutch colonel Hendrik von Prehn, who brought it from South Africa to Europe in the 18th century. In South Africa, where the most translucent specimens have been found, it was known as the "healing stone" in some local traditions. In crystal tradition, prehnite is associated with calm, mental clarity, and intuition.
The symbolic properties attributed to minerals belong to cultural and historical traditions. They are shared for educational purposes, not as medical advice or a substitute for professional care.
How to recognize genuine prehnite
Authentic prehnite is semi-translucent with an internal milky veil, unlike chrysoprase (opaque or semi-opaque, livelier green) and aventurine (opaque quartz with metallic schiller). Under magnification, the internal surface appears homogeneously vitrified, without the granular structure of chalcedony.
Frequently Asked Questions
Is the green dyed?
Untreated. The green color comes from epidote inclusions and variations in the chemical composition of prehnite, without any color treatment.
Does translucence vary between pieces?
Yes. Each variant comes from a fragment with a different inclusion density, which produces variations in translucence from one piece to another. Some areas may be more translucent; others, more veiled. This variation is natural and inherent to the mineral.
Are the dimensions exact?
Nominal dimensions per variant (see table). The dimensional tolerance of the cabochon is ±0.5 mm in any dimension.
How is prehnite cared for?
Warm water and neutral soap; dry thoroughly. Avoid acidic products and ultrasonic cleaners. Store protected from harder minerals. More at jewelry care.
See also: all cabochons · silversmithing · handmade earrings.
