It commonly occurs in its crystalline polymorph ic phase α- 2 3, in which it comprises the mineral
corundum , varieties of which form
Kaynak: Aluminium oxideBauxite pneumoconiosis, also known as Shaver's disease,
corundum smelter's lung, bauxite lung or bauxite smelters' disease, is a
Kaynak: Bauxite fibrosissappheiros, 'blue stone which probably referred instead at the time to lapis lazuli ) is a gemstone variety of the mineral
corundum , an
Kaynak: SapphireA ruby is a pink to blood-red colored gemstone , a variety of the mineral
corundum (aluminium oxide ). The red color is caused mainly
Kaynak: RubyIt largely consists of the mineral
corundum (aluminium oxide ), mixed with other species such as the iron-bearing spinel s hercynite and
Kaynak: Emery (mineral)Corundum group minerals have a 2:3 ratio, and includes minerals such as
corundum (Al 2 O 3), and hematite (Fe 2 O 3). Rutile group
Kaynak: Mineral For example, ruby is the red variety of the species
corundum , while any other color of
corundum is considered sapphire. Another example
Kaynak: GemstoneYogo sapphires are a variety of
corundum found only in Yogo Gulch, part of the Little Belt Mountains in Judith Basin County , Montana ,
Kaynak: Yogo sapphireHematite crystallizes in the rhombohedral system, and it has the same crystal structure as ilmenite and
corundum . Hematite and
Kaynak: HematiteNatural rubies are
corundum (aluminum oxide) crystals that are colored red (the rarest type) due to chromium (III) ions (other colors of
Kaynak: ChromiumAluminium forms one stable oxide, known by its mineral name
corundum . Sapphire and ruby are impure
corundum contaminated with trace
Kaynak: AluminiumBauxite is a very common ore which, along with
corundum's reasonably high hardness, contributes to
corundum's status as a common,
Kaynak: AbrasiveGeuda (pronounced gay-oo-dah) is a form of the mineral
corundum , or sapphire , found primarily in Sri Lanka . Around 70%-80% gems mined
Kaynak: GeudaIt was a former mining town that produced
corundum from deposits in Mount Robillard, directly north of the community. a source for
Corundum.
Kaynak: Craigmont, OntarioIt is primarily used to produce the ruby and sapphire varieties of
corundum , as well as the diamond simulant s rutile and strontium
Kaynak: Verneuil processFor example,
corundum (9) is twice as hard as topaz (8), but diamond (10) is four times as hard as
corundum. The table below shows
Kaynak: Mohs scale of mineral hardnessThe typical asteria is the star- sapphire , generally a bluish-grey
corundum , milky or opalescent, with a star of six rays.
Kaynak: Asterism (gemology)