Strontianite
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Strontianite is an important raw material for the extraction of strontium. It is a rare carbonate mineral and one of only a few strontium minerals. It is a member of the aragonite group.
Strontianite from Slovakia
Radial aggregate of strontianite
Acicular strontianite in spherical aggregates
Strontianite in pseudo-hexagonal crystals
Aegirine
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Aegirine is a mineral. It is a member of the clinopyroxene group of inosilicate minerals. Acmite is a fibrous green-colored variety of aegirine, with the name also used as a synonym. It was first desc
Aegirine (dark) with minor feldspar (light) from Malawi
Syenite with aegirine and acmite from Magnet Cove, Arkansas, US