Twinned Crystals
Cochise College
Virtual Geology Museum
Hall of Minerals
Crystals and Crystal Models
Twinned Crystals
Roger Weller,
geology instructor (
wellerr@cochise.edu )
last edited: 6/19/08 number of photos:
37
wooden crystal models
model 50-octahedron twin:
1
2
3
4
model 52-interpenetration twin of cubes:
1
2
model 82:
1
2
3
4
model 196-gypsum-swallowtail twin:
1
2
3
model 197:
1
2
3
4
5
mineral examples of twinned crystals
aragonite:
1
2
calcite:
1
feldspar-orthoclase:
1
2
3
4
feldspar-polysynthetic twinning:
1
2
3
gypsum:
1
quartz:
1
2
sphalerite:
1
2
3
staurolite:
1
2
3
Photos are copyright free for non-commercial
educational uses.
Just credit photos to R.Weller/Cochise College.
Copyright 2008 R.Weller