Comparison · Minerals vs Feldspar Group
Albite vs Feldspar
Albite and Feldspar are easy to confuse. Both sit near Mohs 6–6.5, 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 Albite and Feldspar
- Both sit near Mohs 6–6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- They overlap in clear, gray, and green, but Albite also comes in blue and Feldspar also comes in pink.
- Well-formed crystals give it away: Albite is Triclinic, Feldspar is Monoclinic to Triclinic (depending on species).
Albite vs Feldspar properties
| Property | Albite | Feldspar |
|---|---|---|
| Type | Minerals | Feldspar Group |
| Mohs hardness | 6–6.5 | 6–6.5 |
| Luster | Vitreous, pearly on cleavage | Vitreous to pearly |
| Streak | White | White |
| Transparency | Transparent to translucent | Transparent to translucent |
| Specific gravity | 2.60–2.65 | 2.55–2.76 |
| Crystal system | Triclinic | Monoclinic to Triclinic (depending on species) |
| Common colors | White, Colorless, Gray, Greenish, Pale blue (rare) | White, Pink, Gray, Green (amazonite), Colorless |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$150+ |
Which is more valuable?
Typical specimens of Albite and Feldspar trade in a similar range, around $20.
About Albite
Albite is the sodium-rich end-member of the plagioclase feldspar series, with the formula NaAlSi3O8, forming a continuous solid-solution series with the calcium end-member anorthite. It typically appears as white, cream, or pale gray tabular crystals with two cleavage directions meeting near a right angle. Its low density and glassy luster set it apart from denser silicates, and it is a defining component of many granites, gneisses, and pegmatites.
About Feldspar
Feldspar is not a single mineral but a group of related aluminosilicate minerals, comprising the potassium feldspars, orthoclase, microcline, and sanidine, and the plagioclase series running from albite to anorthite, together making up roughly 60 percent of Earth's crust by volume. All share a similar framework silicate structure, two cleavage directions near 90 degrees, and moderate hardness, but differ in composition, color, and crystal system. As the most abundant mineral group on the planet, feldspar defines granite, basalt, gneiss, and countless other rock types.
Albite vs Feldspar FAQ
Is Albite the same as Feldspar?
No. Albite is a mineral while Feldspar is a feldspar group. Both sit near Mohs 6–6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Albite from Feldspar?
Both sit near Mohs 6–6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. They overlap in clear, gray, and green, but Albite also comes in blue and Feldspar also comes in pink. Well-formed crystals give it away: Albite is Triclinic, Feldspar is Monoclinic to Triclinic (depending on species).
Which is harder, Albite or Feldspar?
They are about equally hard, both near Mohs 6–6.5.
Which is more valuable, Albite or Feldspar?
Typical specimens of Albite and Feldspar trade in a similar range, around $20.
