mineral
Tumbled Amethyst and Smoky Quartz
Silicon Dioxide (SiO2) with impurities
Hardness: 7; Color: Purple and smoky brown; Luster: Vitreous; Crystal system: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7
- Color
- Purple and smoky brown
- Luster
- Vitreous
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Physical properties
Hardness: 7; Color: Purple and smoky brown; Luster: Vitreous; Crystal system: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or cavities (geodes) within igneous rocks. Purple color comes from iron impurities and natural radiation; smoky color from aluminum impurities and natural radiation.
Uses & applications
Used primarily in jewelry, crystal healing, collection, and ornamental decoration.
Geological facts
Amethyst was considered more valuable than diamonds in ancient times. Smoky quartz is one of the few gray-to-brown gemstones used commonly in faceted jewelry.
Field identification & locations
Identify by characteristic purple or smoky translucent colors and lack of cleavage. Common in Brazil, Uruguay, and Madagascar.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous