Comparison · Silicate Minerals
Microcline vs Nepheline
Microcline and Nepheline 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 Nepheline
- Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- They overlap in green and gray, but Microcline also comes in white and pink and Nepheline also comes in clear, yellow, and red.
- Well-formed crystals give it away: Microcline is triclinic, Nepheline is hexagonal.
Microcline vs Nepheline properties
| Property | Microcline | Nepheline |
|---|---|---|
| Type | Silicate Minerals | Silicate Minerals |
| Mohs hardness | 6 | 6 |
| Luster | vitreous | vitreous |
| Streak | White | White |
| Transparency | translucent | translucent |
| Specific gravity | 2.56 | 2.6 |
| Crystal system | triclinic | hexagonal |
| Common colors | White, Cream, Pink, Green, Gray | Colorless, White, Gray, Yellowish, Greenish, Reddish |
| Rarity | common | uncommon |
| Typical specimen value | $5–$300+ | $5–$150+ |
Which is more valuable?
Microcline is usually the more valuable of the two: a typical collector specimen runs about $40 against $30 for Nepheline, and premium Microcline can reach $300 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 Nepheline
Nepheline is a sodium and potassium aluminosilicate of the feldspathoid group, found in silica-poor igneous rocks. It usually appears as gray, greasy-looking masses and grains rather than well-formed crystals.
Microcline vs Nepheline FAQ
Is Microcline the same as Nepheline?
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 Nepheline?
Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. They overlap in green and gray, but Microcline also comes in white and pink and Nepheline also comes in clear, yellow, and red. Well-formed crystals give it away: Microcline is triclinic, Nepheline is hexagonal.
Which is harder, Microcline or Nepheline?
They are about equally hard, both near Mohs 6.
Which is more valuable, Microcline or Nepheline?
Microcline is usually the more valuable of the two: a typical collector specimen runs about $40 against $30 for Nepheline, and premium Microcline can reach $300 or more.
