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Arzamastsevite, K 6 Al 5 Si 6 O 20 (OH) 4 Cl, a new zeolite with unique Si(OH) 4 group from the Lovozero alkaline massif, Kola Peninsula, Russia

Year: 2025

Type: article

Abstract: Arzamastsevite (IMA2024-085), ideally K 6 Al 5 Si 6 O 20 (OH) 4 Cl, is а new zeolite with unique Si(OH) 4 group.The mineral was found in natrolitized sodalite syenite from Parguaiv Mt. (67°47′22.4″N, 34°35′10″ E), Lovozero alkaline massif, Kola Peninsula, Russia.It occurs as short-prismatic crystals (average 60 µm across) and anhedral grains (average 50 µm across) and is associated with alkali feldspar, sodalite, natrolite, aegirine, magnesio-arfvedsonite, loparite, rhabdophane-(Ce), lamprophyllite, sphalerite, galena, pyrrhotite and pyrite.The largest observed аrzamastsevite crystal is 180 µm across.Aggregates of 2-5 crystals are typically observed.Arzamastsevite is colorless, with a vitreous lustre and white streak.The mineral is brittle.Cleavage was not observed; the fracture is uneven.The measured density is 2.50(5) g⋅cm -3 , the density calculated using the empirical formula and single-crystal unit-cell

Source: Mineralogical Magazine

DOI: 10.1180/mgm.2025.10182

Authors: Julia A. Mikhailova, Yakov A. Pakhomovsky, Ekaterina A. Selivanova, Andrey A. Zolotarev, Sergey M. Aksenov, Vladimir N. Bocharov

Institutions: Kola Science Centre, St Petersburg University

Language: English

Topic: Mineralogy and Gemology Studies

Subfield: Geochemistry and Petrology

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: bronze

Funders: Saint Petersburg State University, Ministry of Science and Higher Education of the Russian Federation

OpenAlex ID: W4416725194