Browse Items (264 total)

See habit.

Formula PbS Structure Non-silicate Crystal System Crystal system: cubic Physical Properties Colour in hand specimen: lead greyStreak: lead greyLustre: metallicCleavage: one, perfectHardness: 2.5 Optical Properties Colour in plane…

Formula (Mg,Fe,Ca)3Al2Si3O12 Structure Orthosilicate Crystal System Crystal system: cubic Physical Properties Colour in hand specimen: typically redCleavage: noneHardness: 6-7.5 Optical Properties Colour in plane polarised…

Taxonomy Phylum: Mollusca Class: Gastropoda Diagnostic Features Coiled shell - planispiral or helical - consists of body whorl and spire Mostly aragonitic shell Shell consists of one large chamber (no septa) Aperture Siphonal notch Way of…

Have a look at the rhyolite glass (L113) in the 1A Reference Series.

Have a look at the hornblende biotite granite (L102) in the 1A Reference Series.