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Silicate

Hydroxymcglassonite-(K)

KSr₄Si₈O₂₀(OH)·8H₂O
Hardness4.5–5
Crystal systemTetragonal
ClassSilicate
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Hydroxymcglassonite-(K)

Hydroxymcglassonite-(K) is an IMA-recognized mineral species in the silicate class, with the chemical formula KSr₄Si₈O₂₀(OH)·8H₂O.

It crystallizes in the tetragonal crystal system. It is a member of the Apophyllite structural group.

Key properties: Mohs hardness 4.5–5; specific gravity 2.6; White streak; Vitreous luster; optically uniaxial.

IMA symbol Hmg, IMA status: approved, named in 2021.

Found in a hydrothermal mineral assemblage.

It is found associated with Meieranite, sugilite, aegirine, pectolite, yuzuxiangite.

The mineral was named to honor James (Jim) A. McGlasson, a retired exploration geologist, mine manager, and consultant.

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 H minerals or help write this entry.