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Plate
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MINERALOGY 1. Normal crystal form developed equally in all dlrec- 4. Network of molecules formed on the lines of
- 'Ons. crystallizing forces shown in 3.
2. Same crystal form as 1, distorted. 5. Further development of network shown In 4 to 3. Crystal molecule showing an arrangement of at- explain cleavage. tractive and repellent forces. 6. Twin crystal formed by two interpenetrated cubes.
