Home > Laskowski Ⅴ – July 20 > MS1905 Kostylevite


Kostylevite is a hydrous potassium zirconium silicate. Khomyakov et al. (1983) named the mineral after honor of Ekaterina Kostyleva-Labuntsova (1894-1974), Russian mineralogist at the Institute of Geology of Ore Deposits, Moscow. She is also the namesake for labuntsovite; very few people have two minerals named in their honor!

Kostyevite forms thick tabular crystals in aggregates to 2 mm in an albite lined vesicle. The matrix consists of aegirine. Lomonosovite and lamprophyllte are also present. From the collection of E.R. Laskowski (1949-2020), a mining engineer who retired to Tucson, Arizona.

Price: $150

Item code: MS1905

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