Goshenite Identification Guide
A practical guide to identifying goshenite, the colorless variety of beryl, including field tests and how to separate it from quartz and topaz.
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What Goshenite Looks Like
Goshenite is the pure, colorless variety of beryl (Be3Al2Si6O18). It is glassy and water-clear, with a vitreous luster and high transparency. When found as crystals it forms classic beryl prisms: six-sided (hexagonal) columns with flat or near-flat terminations and faint lengthwise striations on the prism faces. Because it lacks the trace metals that color aquamarine, emerald, or morganite, goshenite is essentially uncolored, sometimes with a very faint grey or icy tint.
Step-by-Step Field-ID Checklist
- Confirm the crystal shape. Look for a hexagonal prism with vertical striations. A true six-sided column with a flat top strongly favors beryl.
- Check transparency and luster. Goshenite is clear with a clean glassy shine, not greasy or resinous.
- Test hardness. It scratches glass and quartz readily (Mohs 7.5–8).
- Look for the absence of cleavage. Beryl shows poor cleavage and breaks with a conchoidal to uneven fracture.
- Estimate density. Beryl feels noticeably denser than quartz in the hand (SG ~2.6–2.9 vs quartz 2.65, but beryl crystals are heftier than they look).
Key Diagnostic Tests
- Mohs hardness: 7.5–8. Will scratch quartz (7); topaz (8) is comparable, so hardness alone won't separate them.
- Streak: White.
- Cleavage/fracture: Indistinct basal cleavage; conchoidal to uneven fracture.
- Crystal habit: Hexagonal prisms — the single most useful clue when crystals are present.
- Refractive index (if you have a refractometer): 1.57–1.60, lower than topaz (1.61–1.64).
- Density: ~2.66–2.9, lower than topaz (~3.5).
Common Look-Alikes and How to Tell Them Apart
- Clear quartz / rock crystal: Quartz crystals are also hexagonal but taper to a six-sided point rather than a flat termination, and quartz is slightly softer (7). A refractometer cleanly separates them.
- Colorless topaz: Topaz has distinct, perfect basal cleavage (goshenite does not), is denser (heft test), and has higher RI. Topaz often shows a single flat cleavage break.
- Glass/synthetics: Glass has no crystal habit, may contain bubbles, is warmer to the touch, and is usually softer.
- Phenakite and danburite: Rare look-alikes; phenakite has higher RI and danburite is softer (7–7.25) with a different habit.
Where Goshenite Is Found
Goshenite is named for Goshen, Massachusetts. It occurs in granitic pegmatites worldwide, often alongside other beryls. Notable sources include Brazil (Minas Gerais), the Ural Mountains of Russia, Pakistan, Madagascar, Canada, and various New England pegmatites in the USA. Look for it in pockets and miarolitic cavities within coarse-grained granite/pegmatite.
Frequently asked questions
How can you tell if it's real goshenite?
Confirm a hexagonal prism habit with vertical striations, a hardness of 7.5–8 (scratches quartz), poor cleavage with conchoidal fracture, and a refractive index near 1.57–1.60. These together separate goshenite from quartz, topaz, and glass.
What does goshenite look like?
It is colorless, water-clear beryl with a glassy luster, often forming six-sided prismatic crystals with flat terminations and faint lengthwise striations.
Goshenite vs clear quartz: what's the difference?
Both are clear and hexagonal, but quartz crystals taper to a six-sided point while goshenite ends in a flat face. Goshenite is slightly harder and has a higher, distinct refractive index.
Is goshenite the same as white topaz?
No. Topaz has perfect basal cleavage, is much denser, and has a higher refractive index. Goshenite lacks that easy cleavage and feels lighter for its size.
Where is goshenite found?
In granitic pegmatites worldwide, including Brazil, Russia's Urals, Pakistan, Madagascar, Canada, and New England (USA), where it grows in pockets with other beryls.