Siberite Identification Guide
A field guide to siberite, the violet to purplish-red lithium tourmaline, covering color, crystal habit, hardness tests, and how to separate it from amethyst and garnet.
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What Siberite Looks Like
Siberite is a historic varietal name for elbaite (lithium) tourmaline in violet, lilac, and purplish-red to plum tones — essentially purple rubellite. The name honors the original Ural Mountains source in Siberia.
- Color: violet, reddish-purple, plum, sometimes grading toward pink (rubellite)
- Luster: vitreous
- Transparency: transparent to translucent
- Habit: elongate prismatic crystals with a rounded-triangular cross-section and strong vertical striations along the prism
Step-by-Step Field-ID Checklist
- Examine the cross-section. A bulging triangular outline with lengthwise striations is classic tourmaline and rules out quartz.
- Check pleochroism. Rotate the stone; siberite usually shows two tones (e.g., purple/lighter purple), unlike single-color amethyst.
- Test hardness. It scratches glass readily and resists a steel knife (7–7.5).
- Look for color zoning. Purple may shade to pink or even green along the crystal — normal for elbaite.
- Inspect fracture. No flat cleavage planes; breaks are conchoidal.
Key Diagnostic Tests
- Mohs hardness: 7 to 7.5.
- Streak: white.
- Cleavage/fracture: no useful cleavage; uneven to conchoidal fracture.
- Specific gravity: about 3.0–3.1.
- Crystal system: trigonal; vertical prism striations are diagnostic.
- Pyroelectricity: a warmed crystal attracts dust and lint.
Common Look-Alikes and How to Tell Them Apart
- Amethyst (purple quartz): quartz is hexagonal with horizontal growth striations and shows only weak pleochroism. Siberite's triangular cross-section and strong dichroism are the giveaways; tourmaline also becomes electrostatic when warmed.
- Purple/rhodolite garnet: garnet is isometric, so it shows NO pleochroism, forms rounded dodecahedral crystals, and is denser (SG ~3.6+).
- Kunzite (purple-pink spodumene): kunzite has perfect cleavage in two directions (you can see flat reflective breaks) and very strong pleochroism; tourmaline lacks cleavage.
- Purple sapphire: much harder (9) and far denser (SG ~4).
- Purple fluorite: much softer (4), shows octahedral cleavage, and often fluoresces.
The reliable separator is triangular striated prism + dichroism + no cleavage + hardness 7–7.5.
Where Siberite Is Found
The original siberite came from the Ural Mountains (Sarapulka and Mursinka districts) of Siberia, Russia. Today comparable purple elbaite is found in granitic pegmatites in Brazil (Minas Gerais), Madagascar, Mozambique, Afghanistan, Pakistan, Nigeria, and parts of the USA (California, Maine). Search pegmatite pockets alongside lepidolite, albite, and other colored tourmalines.
Frequently asked questions
How can you tell if it's real siberite?
Confirm hardness 7–7.5, a rounded-triangular cross-section with vertical striations, two-tone pleochroism, and no flat cleavage. A crystal that attracts dust when warmed confirms it is tourmaline rather than amethyst or garnet.
What color is siberite?
Siberite is violet to purplish-red and plum-colored lithium tourmaline, often grading toward pink rubellite and sometimes zoning to green within a single crystal.
Siberite vs amethyst — what's the difference?
Amethyst is purple quartz with a hexagonal habit, horizontal striations, and weak pleochroism, while siberite is tourmaline with a triangular cross-section, vertical striations, and strong dichroism.
Is siberite the same as rubellite?
They are closely related elbaite varieties; rubellite is red to pink-red tourmaline, while siberite is the violet to purplish-red end of that range, historically from Siberia.