Comparison · Minerals
Diopside vs Hauyne
Diopside and Hauyne are easy to confuse because both are minerals. 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 Hauyne
- Both sit near Mohs 5.5–6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Streak color differs: Diopside leaves a white streak on unglazed porcelain, Hauyne leaves pale blue.
- Diopside feels noticeably heavier for its size (specific gravity 3.2–3.3 versus 2.4–2.5 for Hauyne).
- They overlap in green, white, and blue, but Diopside also comes in gray, purple, black, and multicolored.
- Well-formed crystals give it away: Diopside is Monoclinic, Hauyne is Isometric.
Diopside vs Hauyne properties
| Property | Diopside | Hauyne |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 5.5–6.5 | 5.5–6 |
| Luster | Vitreous | Vitreous to greasy |
| Streak | White | Pale blue |
| Transparency | Transparent to translucent | Transparent to translucent |
| Specific gravity | 3.2–3.3 | 2.4–2.5 |
| Crystal system | Monoclinic | Isometric |
| Common colors | Light to dark green, White, Gray, Blue-violet (violane), Black (chromian varieties) | Blue, Sky blue, Greenish blue, White |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$150+ |
Which is more valuable?
Typical specimens of Diopside and Hauyne trade in a similar range, around $20.
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 Hauyne
Hauyne, also spelled haüyne, is a sodium calcium aluminum silicate sulfate belonging to the feldspathoid group, crystallizing in the cubic system. Its vivid blue color closely resembles lazurite, the mineral primarily responsible for lapis lazuli's color, though the two form in entirely different geologic settings. It typically occurs as small, well-formed dodecahedral crystals embedded in silica-poor volcanic rock.
Diopside vs Hauyne FAQ
Is Diopside the same as Hauyne?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. 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 Hauyne?
Both sit near Mohs 5.5–6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Streak color differs: Diopside leaves a white streak on unglazed porcelain, Hauyne leaves pale blue. Diopside feels noticeably heavier for its size (specific gravity 3.2–3.3 versus 2.4–2.5 for Hauyne).
Which is harder, Diopside or Hauyne?
They are about equally hard, both near Mohs 5.5–6.5.
Which is more valuable, Diopside or Hauyne?
Typical specimens of Diopside and Hauyne trade in a similar range, around $20.
