Twinned Crystals                            
Cochise College                                                                                        
Virtual Geology Museum
Hall of Minerals                    

Crystals and Crystal Models    

Geology Home Page                      

Roger Weller, geology instructor ( wellerr@cochise.edu )
last edited:  10/25/10    number of photos:  42 


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  2  3
     cerussite:  1  2
     feldspar-orthoclase:  1  2  3  4
     feldspar-polysynthetic twinning:  1  2  3
     gypsum:  1  2
     quartz:  1  2
     sphalerite:  1  2  3
     staurolite:  1  2  3

click here:  link to line drawings of twinned crystals
371 twinned crystal forms

Photos are copyright free for non-commercial educational uses. 
Just credit photos to R.Weller/Cochise College.                                                     

Copyright 2010 R.Weller