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http://haikustones.com/minerals

Chemical: SiO₂
Silicon dioxide
Color: clear, white, green, yellow
Luster: Vitreous, waxy, dull
Transparency: Transparent to opaque
Crystal System: Hexagonal
Cleavage: None
Streak: White
Hardness: 7
Crystal forms: Chalcedony is a microcrystalline
variety of Quartz. It does not occur as crystals but
is botryoidal, mammilary, stalactitic, massive,
nodular, as smooth rounded pebbles, as banded
masses, and in geodes.
Specific gravity: 2.6 - 2.7
Tenacity: Brittle
Many specimens fluoresce, usually
white or green

Legend:
T = Thumbnail Specimen: Size 0.75 - 1.12 Inches (2- 3 cm)
M = Miniature Specimen: Size 1.12 - 2.5 inches (3 - 6 cm)
SC = Small Cabinet Specimen: Size 2.5 - 4 inches (6 - 10 cm)
C = Cabinet Specimen: Size 4 inches (10 cm)
LC = Large Cabinet Specimen: Size above 4 inches (10 cm)

Choose the Specimens you want and send the item code. We'll combine shipping and send you a PayPal invoice. Thank you!

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