Comparison · Silicate Minerals
Scapolite vs Sugilite
Scapolite and Sugilite are easy to confuse because both are silicate minerals. Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Scapolite and Sugilite
- Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Hold a thin edge to the light: Scapolite is transparent, Sugilite is translucent.
- They overlap in pink, purple, and yellow, but Scapolite also comes in white and gray and Sugilite also comes in brown.
- Well-formed crystals give it away: Scapolite is tetragonal, Sugilite is hexagonal.
Scapolite vs Sugilite properties
| Property | Scapolite | Sugilite |
|---|---|---|
| Type | Silicate Minerals | Silicate Minerals |
| Mohs hardness | 6 | 6 |
| Luster | vitreous | vitreous |
| Streak | White | White |
| Transparency | transparent | translucent |
| Specific gravity | 2.65 | 2.74 |
| Crystal system | tetragonal | hexagonal |
| Common colors | White, Pink, Violet, Yellow, Gray | Purple, Violet, Magenta, Pink, Brownish yellow |
| Rarity | uncommon | rare |
| Typical specimen value | $10–$500+ | $15–$1200+ |
Which is more valuable?
Sugilite is usually the more valuable of the two: a typical collector specimen runs about $150 against $70 for Scapolite, and premium Sugilite can reach $1200 or more.
About Scapolite
Scapolite is a group of tectosilicate minerals forming a solid solution between sodium-rich marialite and calcium-rich meionite. It occurs as prismatic crystals or massive material in white, pink, violet, and yellow tones, sometimes showing a cat's-eye effect when cut.
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.
Scapolite vs Sugilite FAQ
Is Scapolite the same as Sugilite?
No. Both are silicate minerals, but they are distinct species with different hardness, streak or luster. Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Scapolite from Sugilite?
Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Hold a thin edge to the light: Scapolite is transparent, Sugilite is translucent. They overlap in pink, purple, and yellow, but Scapolite also comes in white and gray and Sugilite also comes in brown.
Which is harder, Scapolite or Sugilite?
They are about equally hard, both near Mohs 6.
Which is more valuable, Scapolite or Sugilite?
Sugilite is usually the more valuable of the two: a typical collector specimen runs about $150 against $70 for Scapolite, and premium Sugilite can reach $1200 or more.
