Roweite
Roweite is an IMA-recognized mineral species in the borate class, with the chemical formula Ca₂Mn²⁺₂B₄O₇(OH)₆.
It crystallizes in the orthorhombic crystal system (space group Pbam).
Key properties: Mohs hardness 4.5; specific gravity 2.935; optically biaxial.
IMA symbol Rwe, grandfathered status — known before the IMA’s founding, named in 1937.
Very rare in hydrothermal veins in a metamorphosed stratiform zinc orebody (Franklin, New Jersey, USA).
It is found associated with Clinochrysotile, calcite, franklinite, willemite, zincite (Franklin, New Jersey, USA).
The mineral was named to honor George Rowe (1868–1947), Mine Captain at Franklin, New Jersey, USA, and long-time collector of Franklin minerals.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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