- Home
- Rocks
- Type fossils
- Fossil Specimens
- Minerals
- Glossary
- Stratigraphic Chart
- Michel-Levy Chart
- Classification of igneous rocks
- University of Cambridge
- Department of Earth Sciences
- ESC Library
- Moodle
- Sedgwick Museum
- DoITPoMS
- Mindat.org
- Microfossils
- Bryozoans
- Webmineral
- Tree of Life
- CrystalMaker
- Virtual Microscope
Browse Items (4 total)
Sort by:
Pyrite
Formula
FeS2
Structure
Non-silicate
Crystal System
Crystal system: cubic
Physical Properties
Colour in hand specimen: pale brassy yellow; black when fine-grainedStreak: greenish or brownishLustre: metallicCleavage: not…
Hematite
Formula
Fe2O3
Structure
Non-silicate
Crystal System
Crystal system: trigonal (-)
Physical Properties
Colour in hand specimen: black, steel-grey and bright to dull red Streak: cherry-red Cleavage: none Hardness: 5-6
Optical…
Quartz
Formula
SiO2
Structure
Framework silicate
Crystal System
Crystal system: trigonal (+)
Physical Properties
Colour in hand specimen: colourless Lustre: vitreous Pleochroism: none Cleavage: none Hardness: 7
Optical Properties
Colour in…
Plagioclase feldspar
Formula
Na[AlSi3O8] – Ca[Al2Si2O8]
Structure
Framework silicate
Crystal System
Crystal system: triclinic (+) (-)
Physical Properties
Colour in hand specimen: white Cleavage: two at 90° Hardness: 6-6.5
Optical Properties
Colour in…