Green crystals of the extremely rare Sr-V mineral haradaite from the most famous locality for the mineral, the Gambatesa mine, in Italy. — Photo: David Hospital · CC Attribution 4.0
Haradaite
Haradaite is an IMA-recognized mineral species in the silicate class, with the chemical formula SrV⁴⁺Si₂O₇.
It crystallizes in the orthorhombic crystal system (space group Amam).
Key properties: Mohs hardness 4.5; specific gravity 3.8; Vitreous luster; optically biaxial.
IMA symbol Hra, IMA status: approved, named in 1963.
Found in coarse-grained rhodonite ore (Noda-Tamagawa mine, Japan); as veinlets cutting rhodonite-goldmanite ore (Yamato mine, Japan).
It is found associated with Rhodonite, quartz.
The name refers to Zyunpei Harada (1898–1992), Emeritus Professor, Hokkaido University, Sapporo, Japan.