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Quartz varieties are commonly separated into two groups based on the size of the individual grains or crystals; macrocystalline quartz in which individual crystals are distinguishable with the naked eye, and cryptocrystalline quartz in which the individual crystals are too small to be easily distinguishable under the light of the microscope.

 

Quartz	Sio2
Class	Tectosilicate
Crystalline System	Hexagonal - Rhombohedral; 32 (trigonal - trapezohedral)
Hydrogen	0.91 % H 8.15%  H20
Crystal Habit	5Usually Massive with occassional contact crystal faces, occurs rarely as small horizontal striated hexagonal prisms terminated by a combination of positive and negative rhombohedrons forming six sided pyramids.

Specific Gravity

2.65

Index of  Refraction	1.54 - 1.55
PLEOCHROISM	Hexagonal - Rhombohedral; 32 (trigonal - trapezohedral)
Hardness	7
Luster	vitreous

Cleavage	None
Colour	Pale - Pink to Rose Red
Specific Gravity	2.65

   ( View Smoky

 Quartz Stocks )