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Silicate

Roggianite

Ca₂BeAl₂Si₄O₁₃(OH)₂·nH₂O (n < 2.5)
Crystal systemTetragonal
ClassSilicate
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Roggianite specimen

White tufts and acicular crystals of the beryllium silicate mineral roggianite from the type (Alpe Rosso, Vigezzo Valley, Piedmont, Italy) and only one of the two localities known worldwide. — Photo: David Hospital · CC BY-SA 4.0

Roggianite

Roggianite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ca₂BeAl₂Si₄O₁₃(OH)₂·nH₂O (n < 2.5).

It crystallizes in the tetragonal crystal system (space group I4/mcm).

Key properties: specific gravity 2.02; optically uniaxial.

IMA symbol Rog, IMA status: approved, named in 1968.

Coating fractures in a sodic feldspar dike which cuts gneiss (Alpe Rosso, Italy).

It is found associated with Thomsonite (Alpe Rosso, Italy); bertrandite, chrysoberyl, scheelite, molybdenite (Pizzo Marcio, Italy).

The name refers to Aldo G. Roggiani, Italian teacher of natural sciences, who first found the mineral.

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 R minerals or help write this entry.