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MACLAS
“Fairy Cross” Twins
•  The staurolite
crystal shown has
twinning on {031}
•  The small crystals
on the surface are
garnets
Deformation Twins
•  During deformation atoms can be pushed out of
place
•  If this happens to produce a symmetrical
arrangement, it produces deformation twins
Iron Cross Twin
Cristalografia módulo 6 maclas. 2013 ppt

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