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Duotone bay — asphalt brief on the left, yellow-folded service sheet on the right.
tube agate exhibits a hardness of 6
The sphalerite typically appears as dark brown to black
Carbon is included in this quartz piece in several places
and slow crystallization
vitreous luster
Faden Quartz from Colombia DS1553 onyx tube agate exhibits a hardnessFaden Quartz from Colombia Approx. Dimensions: 2x2x1. 5 inches Approx. Weight: 60. 4 grams Locality: Santander, Colombia Faden quartz from Santander, Colombia, is a rare and highly aesthetic find, distinct from the more common specimens found in Pakistan or Russia. While Colombia is world famous for its "needle" and "muzo habit" high clarity quartz, these Faden (German for "thread") crystals are specialized alpine fissure growth formations