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Formula: Ca5(SiO4)2(OH)2
Nesosilicate (insular SiO4 groups), chegemite subgroup,
humite group, forms a series with
kumtyubeite
Crystal System: Monoclinic
Specific gravity: 2.85 measured, 2.885 calculated
Hardness: 5 to 6
Streak: White
Colour: Pale pink
Common impurities: H2O,P
Environments
Volcanic igneous environments
Metamorphic environments
Reinhardbraunsite, like all calcium-humites, is a product of
high-temperature and low-pressure environments, and it is a product of contact metamorphism between high-temperature
magma/lava flows and carbonate rocks
(Mindat).
Localities
At the Bellerberg volcano, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany, reinhardbraunsite occurs in
contact metamorphosed and metasomatised calcium-rich xenoliths in
scoria. Associated minerals include
ellestadite, cuspidine,
gehlenite, brownmillerite,
mayenite and periclase
(HOM).
At the type locality, the Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany,
reinhardbraunsite occurs as anhedral to subhedral grains, up to 3 mm in size, in xenoliths in
scoria. Associated minerals include
periclase, gehlenite,
ellestadite, cuspidine,
chlormayenite and
brownmillerite
(Mindat).
Reinhardbraunsite from the Caspar Quarry -
Image
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