Featured this weekMineral
Staurolite
Fe2Al9Si4O22(OH)2
Staurolite is best known for its distinctive, cross-shaped penetration twins, where two rectangular crystals intersect each other to form a perfect cross.
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Pentlandite is an important mineral due to its nickel content, but it rarely forms in interesting specimens for collectors.
Mineral
Pentlandite
Bismuth is an uncommon mineral composed of the element of the same name. Its rarity is about the same as Silver.
Mineral
Bismuth
Johannsenite is a rare member of the pyroxene group that is isomorphous with Diopside and Hedenbergite.
Mineral
Johannsenite
Goethite is a common mineral, and is a frequent matrix material for other more aesthetic minerals.
Mineral
Goethite
Prehnite forms in both odd and distinct formation habits.
Mineral
Prehnite
Cerussite is an interesting mineral, forming in an array of fascinating crystal formations and bizarre twinning habits.
Mineral
Cerussite
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