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Formula: (Ca,Na)2Sb5+2O6F
Oxide, roméite group,
pyrochlore supergroup,
antimony-bearing mineral, forms a series with
oxyplumboroméite and with
roméite
Crystal System: Isometric
Specific gravity: 5.113 calculated
Hardness: 5½
Streak: White
Colour: Yellow to orange
Luminescence: Non-fluorescent under UV
Environments
Sedimentary environments
Metamorphic environments
Localities
At the type locality, the Starlera Mine, Starlera Valley, Ferrera, Viamala Region, Grisons, Switzerland,
fluorcalcioroméite occurs intimately associated with braunite,
hematite, calcite,
quartz and, rarely,
wallkilldellite. It occurs as euhedral octahedra, untwinned,
from 0.1 to 1 mm in size. The crystals are yellow to orange and translucent with a vitreous to resinous lustre
(MM 77.467-473).
The geological setting is in dolomitic
marble
(Mindat).
Fluorcalcioromeite from the Starlera Mine -
Image
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