Comparison · Minerals vs Silicate Minerals
Diopside vs Tremolite
Diopside and Tremolite are easy to confuse. Both sit near Mohs 5.5–6.5, 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 Diopside and Tremolite
- Both sit near Mohs 5.5–6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Hold a thin edge to the light: Diopside is Transparent to translucent, Tremolite is translucent.
- They overlap in green, white, and gray, but Diopside also comes in blue, purple, black, and multicolored and Tremolite also comes in pink.
- Well-formed crystals give it away: Diopside is Monoclinic, Tremolite is monoclinic.
Diopside vs Tremolite properties
| Property | Diopside | Tremolite |
|---|---|---|
| Type | Minerals | Silicate Minerals |
| Mohs hardness | 5.5–6.5 | 5.5 |
| Luster | Vitreous | vitreous |
| Streak | White | White |
| Transparency | Transparent to translucent | translucent |
| Specific gravity | 3.2–3.3 | 3 |
| Crystal system | Monoclinic | monoclinic |
| Common colors | Light to dark green, White, Gray, Blue-violet (violane), Black (chromian varieties) | White, Gray, Green, Pink |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $8–$250+ |
Which is more valuable?
Tremolite is usually the more valuable of the two: a typical collector specimen runs about $40 against $20 for Diopside, and premium Tremolite can reach $250 or more.
About Diopside
Diopside is a calcium magnesium silicate pyroxene mineral, CaMgSi2O6, common in metamorphosed limestones and mafic to ultramafic igneous rocks. It typically forms stubby prismatic crystals with a nearly square cross-section, a hallmark of the pyroxene group's characteristic cleavage angles. Diopside's color ranges from colorless to deep green depending on iron and chromium content, and chromium-rich varieties are prized as gem material.
About Tremolite
Tremolite is a calcium magnesium amphibole that occurs as bladed, columnar, or fibrous crystals, typically white to gray but ranging to green or pink. It is a common metamorphic mineral and the magnesium end-member of the tremolite-actinolite series.
Diopside vs Tremolite FAQ
Is Diopside the same as Tremolite?
No. Diopside is a mineral while Tremolite is a silicate mineral. Both sit near Mohs 5.5–6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Diopside from Tremolite?
Both sit near Mohs 5.5–6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Hold a thin edge to the light: Diopside is Transparent to translucent, Tremolite is translucent. They overlap in green, white, and gray, but Diopside also comes in blue, purple, black, and multicolored and Tremolite also comes in pink.
Which is harder, Diopside or Tremolite?
Diopside is harder: Mohs 5.5–6.5 against Mohs 5.5 for Tremolite.
Which is more valuable, Diopside or Tremolite?
Tremolite is usually the more valuable of the two: a typical collector specimen runs about $40 against $20 for Diopside, and premium Tremolite can reach $250 or more.
