Aventurine
A macrocrystalline quartz aggregate with flat platy inclusions (typically fuchsite mica for green; hematite/goethite for red-brown; dumortierite for blue) that produce aventurescence — a spangled glitter when rotated. Green aventurine is the most common and is frequently sold as 'Indian jade.' It is NOT microcrystalline quartz (chalcedony) — it is granular crystalline quartz.
Physical & Optical Properties
Related: Quartz Varieties
Key Differentiators
- Aventurescence from flat fuchsite (green mica) platelets — visible under magnification
- Quartz RI (~1.544–1.553) and SG (~2.65) — distinct from jade and chrysoprase
- Aggregate structure — not a single crystal
Common Simulants
- Jadeite: Jadeite: RI 1.660–1.680; SG 3.24–3.43. Much higher RI and SG than aventurine. Interlocking granular texture, not fibrous. Chelsea filter: inert to weak red.
- Nephrite: Nephrite: RI 1.600–1.627; SG 2.90–3.10. Higher RI and SG than aventurine. Fibrous/matted texture.
- Glass aventurine (Goldstone): Isotropic (SR); angular metallic crystals in glass (not flat platelets); conchoidal fracture; SG varies. Easily separated under polariscope and magnification.
Commonly Confused With
Commonly confused with: Jadeite, Nephrite, Chrysoberyl.
Treatments
- Dyed — artificial color introduced to pale material
Price Context
Price context is approximate. GemID is not an appraisal tool. Results are indicators, not certified valuations.
About Aventurine
A macrocrystalline quartz aggregate with flat platy inclusions (typically fuchsite mica for green; hematite/goethite for red-brown; dumortierite for blue) that produce aventurescence — a spangled glitter when rotated. Green aventurine is the most common and is frequently sold as 'Indian jade.' It is NOT microcrystalline quartz (chalcedony) — it is granular crystalline quartz.
Identifying a aventurine? GemID walks through these tests in order — RI, SG, fluorescence, and more.
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