Mineral 1.0Test your knowledge of specific minerals

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Chalcedony  (Micro/Cryptocrystalline Quartz)SiO2

Class: Silicate
Subclass: Framework
Hardness: 7
Density: 2.7
Streak: White
Lustre: Vitreous / almost waxy
Habit: Aggregate of very tiny SiO2 grains.
Colours: White/gray or any colour

  Crystal System: Hexagonal
Cleavage: None
Fracture: Conchoidal
Magnetism: None
Reaction with HCl: None

Identification in hand sample:
Identified by hardness and texture/habit.

Associations:
Abundant in felsic rocks.

Industrial / ecomonic uses:
Used for making glass and as a source of Silicon.

  

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