Comparison · Gemstones vs Feldspar Group
Ammolite vs Feldspar
Ammolite and Feldspar are easy to confuse. Both sit near Mohs 7, 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 Ammolite and Feldspar
- Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Streak color differs: Ammolite leaves a white to light-colored streak on unglazed porcelain, Feldspar leaves white.
- Hold a thin edge to the light: Ammolite is translucent, Feldspar is Transparent to translucent.
Ammolite vs Feldspar properties
| Property | Ammolite | Feldspar |
|---|---|---|
| Type | Gemstones | Feldspar Group |
| Mohs hardness | 7 | 6–6.5 |
| Luster | vitreous | Vitreous to pearly |
| Streak | White to light-colored | White |
| Transparency | translucent | Transparent to translucent |
| Specific gravity | 3 | 2.55–2.76 |
| Crystal system | varies | Monoclinic to Triclinic (depending on species) |
| Common colors | Various | White, Pink, Gray, Green (amazonite), Colorless |
| Rarity | common | common |
| Typical specimen value | $10–$500+ | $2–$150+ |
Which is more valuable?
Ammolite is usually the more valuable of the two: a typical collector specimen runs about $75 against $20 for Feldspar, and premium Ammolite can reach $500 or more.
About Ammolite
Ammolite is organic gemstone formed when it mixes with fossilized shell of extinct marine ammonite.
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.
Ammolite vs Feldspar FAQ
Is Ammolite the same as Feldspar?
No. Ammolite is a gemstone while Feldspar is a feldspar group. Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Ammolite from Feldspar?
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Streak color differs: Ammolite leaves a white to light-colored streak on unglazed porcelain, Feldspar leaves white. Hold a thin edge to the light: Ammolite is translucent, Feldspar is Transparent to translucent.
Which is harder, Ammolite or Feldspar?
Ammolite is harder: Mohs 7 against Mohs 6–6.5 for Feldspar.
Which is more valuable, Ammolite or Feldspar?
Ammolite is usually the more valuable of the two: a typical collector specimen runs about $75 against $20 for Feldspar, and premium Ammolite can reach $500 or more.
