Comparison · Minerals vs Quartz Family
Ametrine vs Quartz
Ametrine and Quartz 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 Ametrine and Quartz
- Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Hold a thin edge to the light: Ametrine is Transparent, Quartz is Transparent to translucent.
- They overlap in yellow and purple, but Quartz also comes in clear, pink, black, gray, and brown.
Ametrine vs Quartz properties
| Property | Ametrine | Quartz |
|---|---|---|
| Type | Minerals | Quartz Family |
| Mohs hardness | 7 | 7 |
| Luster | Vitreous | Vitreous, greasy on fracture surfaces |
| Streak | White | White |
| Transparency | Transparent | Transparent to translucent |
| Specific gravity | 2.65 | 2.65 |
| Crystal system | Trigonal | Trigonal |
| Common colors | Purple and yellow bicolor zoning | Colorless, White, Purple (amethyst), Yellow (citrine), Pink (rose), Brown/black (smoky) |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $5–$250+ |
Which is more valuable?
Quartz is usually the more valuable of the two: a typical collector specimen runs about $35 against $20 for Ametrine, and premium Quartz can reach $250 or more.
About Ametrine
Ametrine is a naturally occurring bicolor variety of quartz that combines the violet tones of amethyst with the golden hues of citrine within a single crystal. The color zoning arises from differing oxidation states of trace iron impurities distributed unevenly across growth sectors of the same silicon dioxide crystal. Most commercial ametrine traces back to a single deposit in Bolivia, though heat-treated material is also common in the gem trade.
About Quartz
Quartz is silicon dioxide, SiO2, one of the most abundant minerals in Earth's continental crust, crystallizing in the trigonal division of the hexagonal crystal system with a hardness of 7 that makes it a standard reference point on the Mohs scale. Its six-sided prismatic crystals, often terminated by pyramidal points, are among the most recognizable crystal shapes in mineralogy. Quartz occurs in nearly every rock type and geologic setting, from granite pegmatites to sedimentary sandstones to hydrothermal veins.
Ametrine vs Quartz FAQ
Is Ametrine the same as Quartz?
No. Ametrine is a mineral while Quartz is a quartz family. 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 Ametrine from Quartz?
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Hold a thin edge to the light: Ametrine is Transparent, Quartz is Transparent to translucent. They overlap in yellow and purple, but Quartz also comes in clear, pink, black, gray, and brown.
Which is harder, Ametrine or Quartz?
They are about equally hard, both near Mohs 7.
Which is more valuable, Ametrine or Quartz?
Quartz is usually the more valuable of the two: a typical collector specimen runs about $35 against $20 for Ametrine, and premium Quartz can reach $250 or more.
