Babingtonite

inosilicate

hedenbergite

Formula: Ca2Fe2+Fe3+Si5O14(OH)
Inosilicate (chain silicate), rhodonite group
Forms a series with manganbabingtonite, and hedenbergite is an epitaxial mineral (Mindat).
Specific gravity: 3.34 to 3.37
Hardness: 5½ to 6
Streak: Brown
Colour: Dark greenish-black
Solubility: Insoluble in acids
Environments:

Plutonic Igneous environments
Volcanic Igneous environments
Pegmatites
Metamorphic environments
Hydrothermal environments
Basaltic cavities

Babingtonite is characteristically a low temperature hydrothermal mineral (AM17.295-303). It occurs in veins cutting granite pegmatite and diorite, in cavities and vugs in mafic volcanic rocks and gneiss and in skarn. Associated minerals include prehnite, calcite, epidote, albite, orthoclase, garnet, quartz, hornblende and zeolites (HOM).

At Nassau, Germany, babingtonite occurs in contact medium grained mafic intrusive rocks and slate associated with ilvaite, beudantite, quartz variety jasper and calcite (AM 17.295-303).

At the Malad quarry, Mumbai District, Maharashtra, India, babingtonite occurs in basalt, in cavities in which laumontite and prehnite casts after laumontite occur. The babingtonite formed at about 200oC and 500 kbar, after calcite and before quartz and prehnite. Pyrite is a common associate (MinRec 34.1.36).

At Baveno, Novara, Italy, babingtonite is found in granite pegmatite associated with microcline, albite, quartz, epidote, tourmaline, zeolites, calcite and hematite (AM 17.295-303).

At the Yakubi mine, Japan, babingtonite occurs at the contact of granodiorite with slate and limestone, associated with hedenbergite, garnet, magnetite, sphalerite, chalcopyrite, quartz and calcite (AM 17.295-303).

At the type locality, the Arendal Iron Mines, Arendal, Norway, babintonite was found occupying solution cavities in large microcline crystals. These cavities appear once to have been filled with albite. (AM 8.215-223). The host rock is a contact iron skarn, and associated minerals are hornblende, garnet, epidote, albite variety oligoclase, albite and calcite (AM 17.295-303).

At Athol, Massachusetts, USA, babingtonite occurs in veins in chlorite gneiss associated with epidote, prehnite and pyrite (AM 17.295-303).

At Buckland, Massachusetts, USA, babingtonite occurs in veins in gneiss associated with epidote, natrolite, chabazite, quartz and calcite (AM 17.295-303).

At Deerfield, Massachusetts, USA, babingtonite occurs in veins in medium grained mafic intrusive rocks associated with prehnite, chlorite, calcite and datolite (AM 17.295-303).

At Holyoke, Massachusetts, USA, babingtonite occurs in veins in medium grained mafic intrusive rocks associated with prehnite, quartz, calcite, datolite, chabazite, natrolite and pyrite (AM 17.295-303).

At Somervile, Massachusetts, USA, babingtonite occurs in veins in medium grained mafic intrusive rocks associated with prehnite, quartz, epidote, chlorite, pyrite, chabazite and calcite (AM 17.295-303).

At Uxbridge, Massachusetts, USA, babingtonite occurs in granite pegmatite associated with microcline, K-feldspar variety adularia, epidote, biotite, hornblende, quartz, heulandite and pyrite (AM 17.295-303).

At the Winchester Highlands, Massachusetts, USA, babingtonite occurs in veins in diorite and granite pegmatite associated with prehnite, epidote, albite, quartz, hornblende, zeolites and calcite (AM 17.295-303).

At Paterson, New Jersey, USA, babingtonite occurs in cavities in amygdaloidal medium grained mafic intrusive rocks, associated with prehnite, quartz, calcite, datolite and zeolites (AM 17.295-303).

Common impurities: Ti,Al,Mg,Na

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