Properties of Fluorite from the North Pennines England

Fluorite has made North Pennines in England famous with collectors because of the well-developed and generally colorful nature of specimens occurring in cavities in both the veins and flats in many of the mines. The habit of North Pennines fluorite is almost always cubic, and crystals under approxim...

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Bibliographic Details
Published in:Rocks & minerals 2004-12, Vol.79 (6), p.399-400
Main Author: Fisher, Jesse
Format: Article
Language:English
Subjects:
Minerals
Mining
Physical properties
Online Access:Get full text
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Summary:Fluorite has made North Pennines in England famous with collectors because of the well-developed and generally colorful nature of specimens occurring in cavities in both the veins and flats in many of the mines. The habit of North Pennines fluorite is almost always cubic, and crystals under approximately 3 cm in size are almost invariably penetration twins on [111], whereas larger crystals are typically untwinned and opaque.
ISSN:0035-7529
1940-1191
DOI:10.1080/00357529.2004.9925744