Helvine is a beryllium-bearing silicate often found in tetrahedral crystal form within skarns or pegmatites. Collectors should look for its distinct tetrahedral habit and characteristic yellow to reddish-brown coloration, frequently confirmed by its orange-red fluorescence under shortwave UV light.
Is this helvine?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch helvine with a known reference. Helvine sits at Mohs 6-6.5, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: vitreous to resinous.
- 4Match the color rangeCompare against the expected color range: yellow, brown, red, gray-yellow, yellow-green.
- 5Look at form & habitCrystal system: cubic. Typical habit: tetrahedral crystals, massive, granular.
Often confused with
Helvine vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Helvine is noticeably harder (Mohs 6-6.5 vs. 3.5-4); streak differs, so Helvine leaves white, Sphalerite leaves pale brown to pale yellow and white; luster reads vitreous to resinous on Helvine and resinous to adamantine on Sphalerite.
Often found alongside helvine
Minerals reported to co-occur with helvine. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Mn₄(BeSiO₄)₃S
- Mohs hardness
- 6-6.5
- Density
- 3.20-3.44 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous to resinous
- Transparency
- Translucent
- Crystal system
- Cubic
- Crystal habit
- Tetrahedral crystals, massive, granular
- Cleavage
- Distinct on {111}, {111}
- Fluorescence
- Often orange-red under SW UV
- Rarity
- Uncommon
- Uses
- Collector, Geological study
- Host rock
- May be locally abundant in granites, granite pegmatites, gneisses, and contact zones and skarns
Where rockhounds find helvine
Classic worldwide localities
- Butte, Silver Bow Co., Montana, USA
- Amelia, Amelia Co., Virginia, USA
- American Tunnel, Silverton, San Juan Co., Colorado, USA
- East fork of Benedict Creek, Sawtooth Mountains, Boise Co., Idaho, USA
- Schwarzenberg and Breitenbrunn, Saxony, Germany
- Yxsjö, Örebro, Sweden
Field-hunting tip
Where it forms: May be locally abundant in granites, granite pegmatites, gneisses, and contact zones and skarns. If you start seeing garnet, magnetite, fluorite in float, you are in the right ground. Typical habit: tetrahedral crystals, massive, granular. Train your eye for that shape before scanning the outcrop.
Common questions
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Find helvine on the map
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