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Nahcolite

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PDM1082185

Nahcolite

Description Tabs

Description
Locality: 
Anvil Points, Rifle, Garfield County, Colorado, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 7.3 × 4.3 cm
Weight: 
138.00gr
Description

Subparallel white fibrous crystals of nahcolite associated to brown argillaceous matrix. It shows a blueish UV fluorescence. This is a well-known, already classic locality, that has produced gorgeous characteristic pieces such as this one.

According to Ertl (1947): “Sodium bicarbonate (nahcolite) was found in the high-grade oil-shale zone of the Parachute Creek member of the Eocene Green River formation in the underground development openings of the Bureau of Mines Oil-Shale Demonstration Mine at Anvil Points, 10 miles west of Rifle, Colorado”.

Infrequent and big specimen, it was acquired by Mr. Gustaaf in 25/10/2003 in the auctions liquidating the Vandenbroucke Museum (Waregem, Belgium). Ex Gustaaf collection #1575, with his handwritten label.

Combine specimens to reduce shipping costs!.

 

Ertl, Tell. (1947). Sodium bicarbonate (nahcolite) from Colorado oil shale. American Mineralogist: 32, (3-4),117-120. Free to download online.

Mineral Data
What's on the rock

Nahcolite

Formula: 
NaHCO3
Strunz: 
5.AA.15
Crystal System: 
Monoclinic
Hardness: 
2.5
Streak: 
White
Type Locality: 
Mt Vesuvius, Somma-Vesuvius Complex, Naples Province, Campania, Italy

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