WHEWELLITE * CRYSTALS ON MATRIX + SIDERITE * RARE ! Bilina, CZECH REPUBLIC

Description

WHEWELLITE
* little
crystals (2-3mm) of whewellite on matrix *
* brownish little crystals of siderite *
* nice and rare specimen from uncommon locality *
size: 54 X 36 X 23mm
weight: 52g
1A6
origin:
Bílina coal mine, Bílina, Teplice District, Ústí nad Labem Region, Czech Republic
Whewellite
-
A rare low-temperature primary hydrothermal mineral in carbonate-sulfide veins; also occurs in geodes, or septarian nodules; associated with coal measures and surrounding rocks with organic material; in some uranium deposits. As microscopic crystals in living plant cells and as calculi or as a sediment in the human urinary tract.
Whewellite is possibly the best known of the crystalline organic minerals. Amber, which is quite well known, is often placed in the Organic Minerals Class, but it lacks a crystalline structure. Some mineral purists might not agree that whewellite is a mineral at all as they tend to dislike any organic connection to minerals (see annapaite). In the example of whewellite, not only is there a connection but organic chemicals are right in the formula! As long as one can ignore the organic chemical connection, whewellite is its own mineral because it is naturally formed, a crystalline solid (repetitive), formed with no direct biological connection and composed of a set chemical formula.
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