Comparison · Igneous Rocks
Aplite vs Monzonite
Aplite and Monzonite are easy to confuse because both are igneous rocks. 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 Aplite and Monzonite
- Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Streak color differs: Aplite leaves a white to pale pink streak on unglazed porcelain, Monzonite leaves variable; usually light gray.
- They overlap in white, pink, and gray, but Aplite also comes in brown and Monzonite also comes in black and green.
Aplite vs Monzonite properties
| Property | Aplite | Monzonite |
|---|---|---|
| Type | Igneous Rocks | Igneous Rocks |
| Mohs hardness | 6 | 6 |
| Luster | dull | dull |
| Streak | White to pale pink | Variable; usually light gray |
| Transparency | opaque | opaque |
| Specific gravity | 2.65 | 2.75 |
| Crystal system | varies | varies |
| Common colors | White, Pink, Cream, Light gray, Tan | Gray, Pink, White, Black, Greenish gray |
| Rarity | common | common |
| Typical specimen value | $1–$75+ | $1–$75+ |
Which is more valuable?
Typical specimens of Aplite and Monzonite trade in a similar range, around $10.
About Aplite
Aplite is a light-colored, fine-grained granitic igneous rock. It often appears white, pink, cream, or light gray and may occur as narrow dikes or veins.
About Monzonite
Monzonite is a coarse-grained intrusive igneous rock with roughly balanced alkali feldspar and plagioclase and little quartz. It can resemble granite or diorite in hand sample.
Aplite vs Monzonite FAQ
Is Aplite the same as Monzonite?
No. Both are igneous rocks, but they are distinct rock types 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 Aplite from Monzonite?
Both sit near Mohs 6, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Streak color differs: Aplite leaves a white to pale pink streak on unglazed porcelain, Monzonite leaves variable; usually light gray. They overlap in white, pink, and gray, but Aplite also comes in brown and Monzonite also comes in black and green.
Which is harder, Aplite or Monzonite?
They are about equally hard, both near Mohs 6.
Which is more valuable, Aplite or Monzonite?
Typical specimens of Aplite and Monzonite trade in a similar range, around $10.
