Locality
10°39´ east longitude, 51°62´ north latitiude   [ map ]

Name
Barbis, Bad Lauterberg, Harz Mts., Germany, Europa

Personal relationship of donor
Geological mapping and mining research

Historical relevance of location
The Harz Mts. are well known not only for metal mining but also for production of industrial minerals such as fluorite (CaF2) and barite (BaSO4).

Geological relevance of location
Quartz veins containing ore minerals and gangue minerals, in this case calcite (CaCO3), siderite, barite (BaSO4) and fluorite (CaF2), cut through the Palaeozoic rocks of the Harz.

Classification of the earth

Structure	the gangue mineral fluorite (CaF2)
Colour	tan, red, white
Age	Late Carboniferous, 300 million years or younger
other	The calcium fluoride mineral fluorite derives its name from its property of lowering the melting point of slag during smelting.

Donor

Geoscientific Collections Section of the Federal Institute for Geosciences and Natural Resources,
 Geological Survey of Lower Saxony,
 Hannover,
 Germany