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Quartz on graphic granite

#48512

Quartz on graphic granite

#48512
Availability
Sold
Size
12 x 9 x 3.5 cm - Cabinet 
Formula
SiO2 (RRUFF)
Locality
Godsend claim, Crystal Peak, Teller Co., Colorado, United States

A great specimen for those who study pegmatites. The specimen is from the Dr. David London collection with his personal collection tag. It is also photographed in London's book "Pegmatites" on page 137, fig. 8-10. 

In the book, it is described as: "A piece of graphic granite in which portions of Quartz rods have been etched away while elsewhere the surface is covered with euhedral crystals of smoky Quartz that are oriented according to the graphic graphic Quartz substrate....."

The Quartz crystals are up to 3cm. Number on specimen matches collection label.

Quartz

Formula
SiO2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Druse, Crystalline - Fine 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, violet, gray, yellow 
Streak
white 
Class
Trigonal - Trapezohedral 
Fracture
Conchoidal 
Hardness

Data courtesy of Webmineral.

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