Identification guide · Silicate Minerals
How to Identify Spodumene
Spodumene is usually pink, lilac, and green with a vitreous luster and is transparent. It has a Mohs hardness of 6.75. It scratches glass and a steel knife and cannot be scratched by a steel file. Its streak is white. It is most often confused with Beryl, Diopside, and Quartz; the tests below separate them.
Spodumene identification checklist
| Color | Pink, Lilac, Green, Yellow, Colorless | Look at a clean, dry surface in daylight. Color zoning, banding or spots are as diagnostic as the hue. |
|---|---|---|
| Luster | Vitreous | Fresh surfaces shine like glass; a dull surface usually means weathering, so chip or wet a corner. |
| Transparency | Transparent | Hold a thin edge up to a bright light and note whether light passes through. |
| Mohs hardness | 6.75 | It scratches glass and a steel knife and cannot be scratched by a steel file. |
| Streak | White | Drag a corner across unglazed porcelain (the back of a bathroom tile) and check the powder color. |
| Cleavage | Perfect prismatic | |
| Fracture | Uneven to subconchoidal | Broken surfaces show smooth, curved, shell-like scoops. |
| Specific gravity | 3.15 | Heavier than it looks (specific gravity about 3.15). |
| Crystal system | Monoclinic |
Extra tests for Spodumene
Glass check. Spodumene shares a glassy luster and conchoidal fracture with man-made glass. Glass sits near Mohs 5.5 and often contains round gas bubbles, so a hardness test and a hand lens separate them.
Spodumene look-alikes and how to tell them apart
Beryl is harder (Mohs 7.5–8) than Spodumene (Mohs 6.75), so Beryl will scratch Spodumene and not the other way round. It scratches glass and a steel knife and cannot be scratched by a steel file. Spodumene vs Beryl →
Both sit near Mohs 6.75, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Spodumene vs Diopside →
Both sit near Mohs 6.75, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Spodumene vs Quartz →
Spodumene is harder (Mohs 6.75) than Natrolite (Mohs 5.5), so Spodumene will scratch Natrolite and not the other way round. It is about as hard as window glass: a knife barely marks it, while a steel file (Mohs 6.5) will.
Field tips
- Look for flattened prismatic crystals with perfect prismatic cleavage and faint vertical striations.
- Pale pink-lilac or green transparent crystals from pegmatites are strong indicators of gem spodumene.
- Hardness near 6.5 to 7 and the pegmatite setting help separate it from softer pink minerals.
Spodumene identification FAQ
How can you tell if a rock is Spodumene?
Check the color (pink, lilac, green, and yellow), the vitreous luster, a Mohs hardness of 6.75 and a white streak. Photographing it with the StoneSnap app gives a match in seconds.
What is the hardness of Spodumene?
Spodumene has a Mohs hardness of 6.75. It scratches glass and a steel knife and cannot be scratched by a steel file.
What is the difference between Spodumene and Beryl?
Spodumene (Mohs 6.75, vitreous luster) and Beryl (Mohs 7.5–8, vitreous luster) look alike, but hardness, streak and heft usually separate them. See the full Spodumene vs Beryl comparison for a side-by-side table.
Is Spodumene worth anything?
Entry-level Spodumene specimens sell for around $10, typical collector pieces about $110, and premium examples $800 or more depending on size, quality and locality.
What color is Spodumene?
Spodumene is most often pink, lilac, green, and yellow. Color varies with impurities and locality, so confirm with hardness and luster rather than color alone.
