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Actions Displays	Details Remove from selection Add to selection Object number COLNH:S212 Institution name Colchester Collections Object name blue john, Derbyshire spar, fluorspar, fluorite Description A specimen of Blue John, also known as Derbyshire Spar. This semi-precious mineral is a form of fluorite with bands of a purple-blue or yellowish colour. In the UK it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire. During the 1800s century, it was mined for its ornamental value, and mining continues on a small scale. Subject Geology Location In Store Tags Comments Add tag(s) Add comment

Object number

COLNH:S212
Institution name

Colchester Collections
Object name

blue john, Derbyshire spar, fluorspar, fluorite
Description

A specimen of Blue John, also known as Derbyshire Spar. This semi-precious mineral is a form of fluorite with bands of a purple-blue or yellowish colour. In the UK it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire. During the 1800s century, it was mined for its ornamental value, and mining continues on a small scale.
Subject

Geology
Location

In Store

Details