Maruyamaite
Maruyamaite is an IMA-recognized mineral species in the silicate class, with the chemical formula K(MgAl₂)(Al₅Mg)(BO₃)₃(Si₆O₁₈)(OH)₃O.
It crystallizes in the hexagonal crystal system (space group R3m). It is a member of the Tourmaline structural group.
Key properties: Mohs hardness 7; specific gravity 3.081; White to very pale-brown streak; Vitreous luster; optically uniaxial.
IMA symbol Mry, IMA status: approved, named in 2013.
From ultrahigh-pressure, diamond-bearing gneiss.
It is found associated with Diamond, quartz, K-feldspar.
The mineral was named to honor Professor Shigenori Maruyama (b. 1949), Earth-Life Science Institute, Tokyo Institute of Technology, Japan, for his work on regional tectonics.
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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