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Formula: Ca2Sb5+2O
Oxide, roméite group,
pyrochlore supergroup,
antimony-bearing mineral
Crystal System: Isometric
Specific gravity: 5.393 calculated
Streak: Pale yellow
Colour: Reddish brown
Luminescence: No fluorescence under UV
Environments
Pegmatites
Metamorphic environments
Oxycalcioromeite is a relatively new mineral, approved in 2012.
Localities
At the Nanyangshan pegmatite field, Lushi County, Sanmenxia, Henan, China,
stibiotantalite occurs on the
lithium - cesium -
tantalum pegmatite,
associated with oxystibiomicrolite, oxycalcioroméite,
hydrokenomicrolite,
hydroxynatromicrolite (not an approved mineral),
hydromicrolite (not yet approved, February 2024), stibnite,
bismuthinite,
tantalite-(Mn),
columbite-(Mn), spodumene,
polylithionite,
trilithionite,
luanshiweiite,
fluorluanshiweiite,
elbaite, albite and
quartz
(CJMP 61.5.965–977).
At the type locality, the Buca della Vena Mine, Pontestazzemese, Stazzema, Lucca Province, Tuscany, Italy,
oxycalcioroméite occurs as euhedral octahedra, up to 0.1 mm in size, embedded in
dolostone lenses at the zoned
baryte - pyrite -
magnetite - hematite ore body
at the contact between a metavolcanic-metasedimentary Triassic (252-201 million years ago)
schist and dolostone
and Lower Jurassic (201 to 175 million years ago) marble. The
oxycalcioroméite crystallised from hydrothermal fluids related to Alpine metamorphism of
greenschist facies. Associated minerals include
calcite, cinnabar,
derbylite, dolomite,
hematite, mica,
pyrite, sphalerite and
tourmaline
(MM 77.3027-3037).
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