Comparison · Minerals
Satin Spar vs Selenite
Satin Spar and Selenite are easy to confuse because both are minerals. Both sit near Mohs 2, 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 Satin Spar and Selenite
- Both sit near Mohs 2, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Luster is different: Satin Spar is silky while Selenite is vitreous.
- Hold a thin edge to the light: Satin Spar is translucent, Selenite is transparent.
- They overlap in clear and pink, but Selenite also comes in gray.
Satin Spar vs Selenite properties
| Property | Satin Spar | Selenite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 2 | 2 |
| Luster | silky | vitreous |
| Streak | White | White |
| Transparency | translucent | transparent |
| Specific gravity | 2.3 | 2.3 |
| Crystal system | monoclinic | monoclinic |
| Common colors | White, Cream, Colorless, Peach | Colorless, White, Peach, Gray |
| Rarity | common | common |
| Typical specimen value | $5–$120+ | $5–$150+ |
Which is more valuable?
Typical specimens of Satin Spar and Selenite trade in a similar range, around $20.
About Satin Spar
Satin Spar is a fibrous variety of gypsum recognized by its silky sheen, white to cream color, and soft hardness.
About Selenite
Selenite is a crystalline form of gypsum known for its transparency and moon-like glow. The Cave of Crystals in Mexico contains selenite crystals up to 12 meters long.
Satin Spar vs Selenite FAQ
Is Satin Spar the same as Selenite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Both sit near Mohs 2, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Satin Spar from Selenite?
Both sit near Mohs 2, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Luster is different: Satin Spar is silky while Selenite is vitreous. Hold a thin edge to the light: Satin Spar is translucent, Selenite is transparent.
Which is harder, Satin Spar or Selenite?
They are about equally hard, both near Mohs 2.
Which is more valuable, Satin Spar or Selenite?
Typical specimens of Satin Spar and Selenite trade in a similar range, around $20.
