Blue John
A variety of Fluorite
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About Blue John
Formula:
CaF2
Name:
The name was given by two miners, John Kirk and Joseph Hall in the 18th century in the same style as the name 'black jack' which was the local name for sphalerite.
First Recorded Locality:
A variety of Fluorite
A local name for a banded white/purple variety of fluorite from the Castleton area of Derbyshire, England, UK.
A local name for a banded white/purple variety of fluorite from the Castleton area of Derbyshire, England, UK.
Visit gemdat.org for gemological information about Blue John.
Unique Identifiers
Mindat ID:
698 (as Blue John)
1576 (as Fluorite)
1576 (as Fluorite)
Long-form identifier:
mindat:1:1:698:5 (as Blue John)
mindat:1:1:1576:5 (as Fluorite)
mindat:1:1:1576:5 (as Fluorite)
GUID
(UUID V4):
(UUID V4):
c0206327-5c26-4d4a-9441-6152431a73f6 (as Blue John)
fa6f81a0-7691-46e7-9731-0435742f9b4e (as Fluorite)
fa6f81a0-7691-46e7-9731-0435742f9b4e (as Fluorite)
Chemistry of Blue John
Mindat Formula:
CaF2
Elements listed:
First Recorded Occurrence of Blue John
Common Associates
Associated Minerals Based on Photo Data:
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Blue John
mindat.org URL:
https://www.mindat.org/min-698.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Blue John
Localities for Blue John
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Norway | |
| Larsen et al. (2021) |
UK (FRL) | |
| Dewey et al. (1922) |
[www.thamesvalleyminerals.com] | |
Mason (1976) +1 other reference | |
Quirk (1986) |
Old Tor Mine, Castleton, High Peak, Derbyshire, England, UK