Comparison · Minerals vs Silicate Minerals
Lepidolite vs Sugilite
Lepidolite and Sugilite are easy to confuse. Sugilite is harder (Mohs 6) than Lepidolite (Mohs 2.5), so Sugilite will scratch Lepidolite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Lepidolite and Sugilite
- Sugilite is harder (Mohs 6) than Lepidolite (Mohs 2.5), so Sugilite will scratch Lepidolite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
- Luster is different: Lepidolite is pearly while Sugilite is vitreous.
- They overlap in pink and purple, but Sugilite also comes in brown and yellow.
- Well-formed crystals give it away: Lepidolite is monoclinic, Sugilite is hexagonal.
Lepidolite vs Sugilite properties
| Property | Lepidolite | Sugilite |
|---|---|---|
| Type | Minerals | Silicate Minerals |
| Mohs hardness | 2.5 | 6 |
| Luster | pearly | vitreous |
| Streak | White | White |
| Transparency | translucent | translucent |
| Specific gravity | 2.85 | 2.74 |
| Crystal system | monoclinic | hexagonal |
| Common colors | Pink, Purple, Lilac, Rose | Purple, Violet, Magenta, Pink, Brownish yellow |
| Rarity | uncommon | rare |
| Typical specimen value | $5–$100+ | $15–$1200+ |
Which is more valuable?
Sugilite is usually the more valuable of the two: a typical collector specimen runs about $150 against $20 for Lepidolite, and premium Sugilite can reach $1200 or more.
About Lepidolite
Lepidolite is a pink to purple lithium-bearing mica. It's an important source of lithium and valued for its soft lavender color.
About Sugilite
Sugilite is a rare lithium-bearing cyclosilicate best known for its vivid purple to magenta gem material. It usually occurs as massive aggregates rather than crystals and is used as an ornamental and lapidary stone.
Lepidolite vs Sugilite FAQ
Is Lepidolite the same as Sugilite?
No. Lepidolite is a mineral while Sugilite is a silicate mineral. Sugilite is harder (Mohs 6) than Lepidolite (Mohs 2.5), so Sugilite will scratch Lepidolite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
How can you tell Lepidolite from Sugilite?
Sugilite is harder (Mohs 6) than Lepidolite (Mohs 2.5), so Sugilite will scratch Lepidolite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Luster is different: Lepidolite is pearly while Sugilite is vitreous. They overlap in pink and purple, but Sugilite also comes in brown and yellow.
Which is harder, Lepidolite or Sugilite?
Sugilite is harder: Mohs 6 against Mohs 2.5 for Lepidolite.
Which is more valuable, Lepidolite or Sugilite?
Sugilite is usually the more valuable of the two: a typical collector specimen runs about $150 against $20 for Lepidolite, and premium Sugilite can reach $1200 or more.
