Roméite

romeite

Images

Roméite is a series comprising
Fluorcalcioroméite: (Ca,Na)₂Sb⁵⁺₂O₆F
Hydroxycalcioroméite: (Ca,Sb³⁺)₂(Sb⁵⁺,Ti)₂O₆(OH)
Hydroxyferroroméite: (Fe²⁺_1.5☐_0.5)Sb⁵⁺₂O₆(OH)
Oxycalcioroméite: Ca₂Sb⁵⁺₂O
Oxyplumboroméite: Pb₂Sb₂O₇

All the minerals are oxides, roméite group, pyrochlore supergroup
Specific gravity (calculated): 6.732 (oxyplumboroméite) 5.113 (fluorcalcioroméite)
Hardness: 5 (oxyplumboroméite) 5½ (fluorcalcioroméite)
Streak: Brownish yellow
Colour: Yellow to brownish yellow (oxyplumboroméite), yellow to orange (fluorcalcioroméite)
Common impurities: Ca,Fe³⁺,Mn,Na
Environments:

Metamorphic environments

Roméite is a secondary mineral in some manganese-bearing hydrothermal mineral deposits which commonly have undergone metamorphism (Webmin, HOM, Dana).

Localities

Tripuí, Ouro Preto district, Ouro Preto, Minas Gerais, Brazil is the type locality for hydroxylcalcioroméite.

At St. Marcel, Italy, roméite is associated with epidote and manganese oxides (HOM).

At its type locality, the Starlera Mine, Starlera Valley, Ferrera Valley, Hinterrhein Valley, Grisons, Switzerland, fluorcalcioroméite is associated with braunite, calcite, hematite, quartz and wallkilldellite (Mindat).

At its type locality, the Harstigen Mine, Pajsberg, Persberg ore district, Filipstad, Värmland County, Sweden, oxyplumboroméite is found in fissure fillings in tephroite skarn, associated with tephroite, leucophoenicite and calcite (Mindat).

At Franklin, New Jersey, USA, roméite is associated with yeatmanite, sarkinite, willemite, diopside and andradite (HOM).

Back to Minerals