Comparison · Minerals
Andalusite vs Aventurine
Andalusite and Aventurine are easy to confuse because both are minerals. Both sit near Mohs 6.5–7.5, 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 Andalusite and Aventurine
- Both sit near Mohs 6.5–7.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Andalusite feels noticeably heavier for its size (specific gravity 3.13–3.21 versus 2.64–2.69 for Aventurine).
- Hold a thin edge to the light: Andalusite is Transparent to translucent, Aventurine is Translucent.
- They overlap in brown, red, and green, but Andalusite also comes in gray and pink and Aventurine also comes in blue and orange.
- Well-formed crystals give it away: Andalusite is Orthorhombic, Aventurine is Trigonal.
Andalusite vs Aventurine properties
| Property | Andalusite | Aventurine |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 6.5–7.5 | 6.5–7 |
| Luster | Vitreous | Vitreous, aventurescent (glittery) |
| Streak | White | White |
| Transparency | Transparent to translucent | Translucent |
| Specific gravity | 3.13–3.21 | 2.64–2.69 |
| Crystal system | Orthorhombic | Trigonal |
| Common colors | Reddish brown, Olive green, Gray, Pink | Green, Blue, Orange, Brown, Red |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$150+ |
Which is more valuable?
Typical specimens of Andalusite and Aventurine trade in a similar range, around $20.
About Andalusite
Andalusite is an aluminum silicate, Al2SiO5, and one of three natural polymorphs sharing that exact formula along with kyanite and sillimanite. It crystallizes in the orthorhombic system as stout, nearly square prisms formed under low-pressure, moderate-temperature metamorphism. Its variety chiastolite, which displays a dark cross pattern in cross-section, makes it one of the more recognizable metamorphic minerals to casual collectors.
About Aventurine
Aventurine is a variety of quartzite prized for aventurescence, a sparkly, glittery sheen caused by light reflecting off tiny platy mineral inclusions suspended within the rock. Green aventurine owes its color to included flakes of the chromium mica fuchsite, while orange to reddish varieties contain hematite or goethite instead. Though often sold alongside single minerals, it is technically a metamorphic rock made mostly of interlocking quartz grains.
Andalusite vs Aventurine FAQ
Is Andalusite the same as Aventurine?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Both sit near Mohs 6.5–7.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Andalusite from Aventurine?
Both sit near Mohs 6.5–7.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Andalusite feels noticeably heavier for its size (specific gravity 3.13–3.21 versus 2.64–2.69 for Aventurine). Hold a thin edge to the light: Andalusite is Transparent to translucent, Aventurine is Translucent.
Which is harder, Andalusite or Aventurine?
They are about equally hard, both near Mohs 6.5–7.5.
Which is more valuable, Andalusite or Aventurine?
Typical specimens of Andalusite and Aventurine trade in a similar range, around $20.
