mineral
Mixed Gemstones and Minerals
Mixed Silicates and Oxides (Quartz/Amethyst, Aventurine, Sodalite, Chert, Jasper)
Hardness: 6.5-7 (Mohs); Colors: Purple, Green, Blue/Grey, Red, Black; Luster: Vitreous to waxy; Texture: Granular to fine-grained; Crystal System: Hexagonal/Trigonal.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Colors: Purple, Green, Blue/Grey, Red, Black; Luster: Vitreous to waxy; Texture: Granular to fine-grained; Crystal System: Hexagonal/Trigonal.
Formation & geological history
Formed primarily through hydrothermal processes (Amethyst, Aventurine) or sedimentary deposition (Chert, Jasper). Specific geological ages vary by source, typically spanning from Precambrian to Cenozoic eras.
Uses & applications
Metaphysical collecting, jewelry cabochons, lapidary practice, and educational pebble sets.
Geological facts
This collection includes Amethyst (purple variety of quartz), Green Aventurine (quartz with mica inclusions), Sodalite (the blue/white specimen), and various microcrystalline silicates like Jasper or Chert.
Field identification & locations
Identify by color and conchoidal fracture patterns. Found globally in riverbeds or mined in regions like Brazil, India, and South Africa. These are common tumbles often found in 'mine your own' kits for kids.
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sedimentary
Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic