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2General
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Mineral" class="copylinks">Mineral
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Chemical_formula" class="copylinks">Chemical Formula Aluminium Oxide , Al<sub>2</sub>O<sub>3</sub>
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2Identification
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Crystal_habit" class="copylinks">Crystal Habit Steep bipyramidal, tabular, prismatic, rhombohedral crystals, massive or granular
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Crystal_structure" class="copylinks">Crystal System Trigonal Hexagonal Scalenohedral bar32/m
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Crystal_twinning" class="copylinks">Twinning Polysynthetic twinning common
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Cleavage_(crystal)" class="copylinks">Cleavage None - parting in 3 directions
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Fracture" class="copylinks">Fracture Conchoidal to uneven
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Mohs_Scale" class="copylinks">Mohs Scale hardness 9
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Refractive_index" class="copylinks">Refractive Index nω=1768 - 1772 nε=1760 - 1763, Biref 0009
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Pleochroism" class="copylinks">Pleochroism None
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Mineral#Streak" class="copylinks">Streak White
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Specific_gravity" class="copylinks">Specific Gravity 395-41
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Fusibility" class="copylinks">Fusibility Infusible
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Solubility" class="copylinks">Solubility Insoluble
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2Major varieties
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Sapphire" class="copylinks">Sapphire Any color except red
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Ruby" class="copylinks">Ruby Red
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"http://wwwinformationdelightinfo/encyclopedia/entry/Vrhbosna/Emery_(mineral)" class="copylinks">Emery Granular
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