Minerals are the building materials of our technological civilization and a single mineral may have many unrelated uses The mineral corundum provides a good example Corundum is an extremely hard substance Small bits of corundum are part of the rock called "emery" which has been used since ancient times as an abrasive to cut and grind metal
·Corundum a royal family of precious stones admired for its rubies and sapphires offers an unexpected diversity of hues Discover its geological formation its historical role and its metaphysical properties The mineral can also be found in the form of massive and granular formations as well as in the form of rolled pebbles Rough
Corundum is a mineral distinguishable by its hardness durability and hexagonal barrel shaped crystals It is one of the hardest existing minerals second to diamond on the Mohs hardness scale
THE three works cited below give much new and valuable information concerning the mode of occurrence the processes of mining and the uses of corundum As the mineral is of growing economic value and is every day finding fresh applications in the arts it seems desirable to call attention to some of the facts which are for the first time made accessible to the public in these
·Corundum is a significant mineral found in various types of rocks such as igneous metamorphic and sedimentary and belongs to the trigonal crystal system The interesting thing about the corundum mineral family is its extraordinary hardness and lovely appearance which make it a very valuable mineral Clarity matters though most have inclusions
Corundum is best known for its gem varieties Ruby and Sapphire Ruby and Sapphire are scientifically the same mineral but just differ in color Ruby is the red variety and Sapphire is the variety that encompasses all other colors although the
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