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Pyrochlore
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| Pyrochlor Vishnevye Mts (Vishnyovye; Cherry), Chelyabinsk Oblast', Southern Urals, Urals Region, Russia
Item-No.: MIN2580 Price: 185.00 EUR
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Synonyms: |
Azor-phyrrite, Azorpyrrhite, Endeiolite, Fluochlor, Hydrochlor, Niobpyrochlor, Pyrochlor |
IMA status: |
Not recognized, name for a group of niobium dominant members of Pyrochlore Supergroup |
Classification: |
Oxides, Pyrochlor Group |
Chemical formula: |
A2Nb2(O,OH)6Z {A = Na, Ca, Sn2+, Sr, Pb2+, Sb3+, Y, U4+, H2O ; Z = OH, F, O, H2O} |
Crystal system: |
Isometric |
Density (g/cm3): |
4,2 - 6,4 calculated |
Tenacity: |
splintery |
Cleavage: |
Indistinct on {111} |
Fracture: |
Irregular/uneven, splintery, sub-conchoidal |
Hardness (Mohs): |
5 - 5,5 |
Colour: |
Brown, yellowish-brown, yellow, greenisch-brown, reddisch-brown, black |
Lustre: |
Vitreous, Resinous |
Streak: |
Yellowish-brown |
Transparency: |
Transparent to opaque |
Type locality: |
Stavern (Fredriksvärn), Larvik, Vestfold, Norway |
Application: |
Source of niobium, tantalum and thorium |
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