Mineral 1.0Test your knowledge of specific minerals

M
E
N
U
« Home | Browse Minerals | QuizzesMinerals by letter: All | K | G | O | A | H | T | P | C | Q | N | Z | S | E | W | M | B | F | D | L
Minerals by class: Silicates | Halides | Carbonates | Sulfates | Oxides | Phosphates | Hydroxides | Native elements | Sulfides
Silicate Subclasses: Nesosilicates | Pyroxenes | Amphiboles | Frameworks | Sorosilicates | Cyclosilicates | Phyllosilicates
  

« Back to minerals starting with C

C
H
A
L
C
E
D
O
N
Y

Click for expanded view






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.

  

Inaccurate data? Better photos? .