Comparison · Silicate Minerals
Microcline vs Zoisite
Microcline and Zoisite 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 Microcline and Zoisite
- Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Zoisite feels noticeably heavier for its size (specific gravity 3.3 versus 2.56 for Microcline).
- Hold a thin edge to the light: Microcline is translucent, Zoisite is transparent.
- They overlap in pink, green, and gray, but Microcline also comes in white and Zoisite also comes in blue.
- Well-formed crystals give it away: Microcline is triclinic, Zoisite is orthorhombic.
Microcline vs Zoisite properties
| Property | Microcline | Zoisite |
|---|---|---|
| Type | Silicate Minerals | Silicate Minerals |
| Mohs hardness | 6 | 6.5 |
| Luster | vitreous | vitreous |
| Streak | White | White |
| Transparency | translucent | transparent |
| Specific gravity | 2.56 | 3.3 |
| Crystal system | triclinic | orthorhombic |
| Common colors | White, Cream, Pink, Green, Gray | Green, Pink, Blue, Gray |
| Rarity | common | uncommon |
| Typical specimen value | $5–$300+ | $12–$450+ |
Which is more valuable?
Zoisite is usually the more valuable of the two: a typical collector specimen runs about $70 against $40 for Microcline, and premium Zoisite can reach $450 or more.
About Microcline
Microcline is a potassium-rich feldspar and a rock-forming mineral in granites and pegmatites. Its blue-green gem variety, amazonite, is widely collected, while ordinary microcline appears as cream, pink, or gray crystals and masses.
About Zoisite
Zoisite is a calcium aluminum silicate that occurs in striated prismatic crystals and massive aggregates. Best known through its blue-violet gem variety tanzanite and the pink variety thulite, it is both a metamorphic mineral and a notable gemstone.
Microcline vs Zoisite FAQ
Is Microcline the same as Zoisite?
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 Microcline from Zoisite?
Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Zoisite feels noticeably heavier for its size (specific gravity 3.3 versus 2.56 for Microcline). Hold a thin edge to the light: Microcline is translucent, Zoisite is transparent.
Which is harder, Microcline or Zoisite?
Zoisite is harder: Mohs 6.5 against Mohs 6 for Microcline.
Which is more valuable, Microcline or Zoisite?
Zoisite is usually the more valuable of the two: a typical collector specimen runs about $70 against $40 for Microcline, and premium Zoisite can reach $450 or more.
