Segerstromite
Segerstromite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca₃(As⁵⁺O₄)₂[As³⁺(OH)₃]₂.
It crystallizes in the cubic crystal system (space group I2_13).
Key properties: Mohs hardness 4.5; specific gravity 3.44; White streak; Vitreous luster.
IMA symbol Ssr, IMA status: approved, named in 2014.
Found as a secondary mineral in a Pb-Ag-As-Cu-Zn deposit hosted in sedimentary and volcanic rocks.
It is found associated with Talmessite, vladimirite, Sr-bearing hydroxylapatite.
The mineral was named to honor Kenneth Segerstrom (1909-1992), geologist for the U.S. Geological Survey in the U.S., Mexico, and Chile, conducting field-based regional geologic studies.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more S minerals or help write this entry.