Ruitenbergite
Ruitenbergite is an IMA-recognized mineral species in the halide class, with the chemical formula Ca₉B₂₆O₃₄(OH)₂₄Cl₄·13H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1).
Key properties: Mohs hardness 3–4; specific gravity 2.13; White streak; Vitreous luster; optically biaxial.
IMA symbol Rtb, IMA status: approved, named in 1992.
Very rare, in an evaporite deposit.
It is found associated with Halite, pringleite, hilgardite-1A, sylvite, anhydrite, quartz, clays.
The mineral was named to honor Dr. Arie A. Ruitenberg (1929–), geologist, Geological Surveys Branch, New Brunswick Department of Natural Resources, Sussex, Canada.
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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