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 Post subject: Blue john stone
PostPosted: Tue May 21, 2019 4:08 pm 
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Joined: Mon May 20, 2019 3:47 pm
Posts: 29
"Blue John stone" Routh on matrix from Castleton Derbyshire UK close to where i live.

About the Stone:
Blue john stone is only found in cave mines at Castleton Derbyshire uk
Blue john is a rare Fluorite that forms blue to dark purple band rings
or veins.
Was used in 18th to beginning of 19th century for making huge vase's or ornaments.
Now a days, Made into small jewellery.

Blue john is stilled mined in small amounts from "Treak cliff cavern"
No large veins of Blue john exist any more with been over mined and only small pockets are now found.

Stone: Blue John - Type of Fluorite.
Colour: Blue. Dark purple. Yellow. Pink. Red. Black. Green. Colour less.
Refractive Index: 1.43
Relative Density: 3.2
Hardness: 4
Crystal group: Cubic
Tenacity: Brittle
Origen: Castleton Derbyshire uk

PS: Specimens I have I got way back in late 80s and stored away till just recently
got out to take photos off. Never weighed them just stored away. There was mined
from "Treak cliff cavern".

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