mineral
Botryoidal Quartz / Calcite Geode crust
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
Hardness: 7 (if quartz) or 3 (if calcite); Color: White, cream, or colorless; Luster: Vitreous to pearly; Crystal structure: Trigonal or Hexagonal; Specific gravity: 2.65 or 2.71
- Hardness
- 7 (if quartz) or 3 (if calcite)
- Color
- White, cream, or colorless
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 7 (if quartz) or 3 (if calcite); Color: White, cream, or colorless; Luster: Vitreous to pearly; Crystal structure: Trigonal or Hexagonal; Specific gravity: 2.65 or 2.71
Formation & geological history
Formed through hydrothermal precipitation in rock cavities or vugs, where mineral-rich water slowly deposits layers over thousands of years.
Uses & applications
Commonly used for geological displays, decorative home decor, crystal healing collections, and educational specimens.
Geological facts
Botryoidal formations get their name from the Greek word 'botrys', meaning a bunch of grapes, due to the rounded, bubbly appearance of the mineral growth.
Field identification & locations
Identified by its cauliflower-like or 'bubbly' texture. To distinguish between quartz and calcite, one can perform an acid test (calcite fizzes) or a hardness test (quartz scratches glass).
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Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral