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Mineral definition and classification
To be classified as a "true" mineral, a substance must be a solid and have a crystal structure. It must also be an inorganic, naturally-occurring, homogeneous substance with a defined chemical composition. The chemical composition may vary between end members of a mineral system. For example the plagioclase feldspars comprise a continuous series from sodium-rich albite (NaAlSi3O8) to calcium-rich anorthite (CaAl2Si2O8) with four recognized intermediate compositions between. Mineral-like substances that don't strictly meet the definition are sometimes classified as mineraloids. Other natural-occurring substances are Nonminerals. Industrial minerals is a market term and refers to commercially valuable mined materials (see also Minerals and Rocks section below).
A crystal structure is the orderly geometric spatial arrangement of atoms in the internal structure of a mineral. There are 14 basic crystal lattice arrangements of atoms in three dimensions, and these are referred to as the 14 "Bravais lattices". Each of these lattices can be classified into one of the six crystal systems, and all crystal structures currently recognized fit in one Bravais lattice and one crystal system. This crystal structure is based on regular internal atomic or ionic arrangement that is often expressed in the geometric form that the crystal takes. Even when the mineral grains are too small to see or are irregularly shaped, the underlying crystal structure is always periodic, and can be determined by X-ray diffraction.
Chemistry and crystal structure together define a mineral. In fact, two or more minerals may have the same chemical composition, but differ in crystal structure (these are known as polymorphs). For example, pyrite and marcasite are both iron sulfide, but their arrangement of atoms differs. Similarly, some minerals have different chemical compositions, but the same crystal structure: for example, halite (made from sodium and chlorine), galena (made from lead and sulfur) and periclase (made from magnesium and oxygen) all share the same cubic crystal structure.
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@adityodp hahhaha..weeds with large amount better than small one:) but in law both are same:( Re:Vitamins and Minerals http://myloc.me/1kP0g
ajeskoagogo (rais hakiem anwar) Wed, 04 Nov 2009 14:43:09 -0000
@adityodp hahhaha..weeds with large amount better than small one:) but in law both are same:( Re:Vitamins and Minerals http://myloc.me/1kP0g
Weeds small amounts, ngotor2in paru2.. RT @ajeskoagogo: Vitamins and minerals small amounts, large effect.
adityodp (adityodp) Wed, 04 Nov 2009 14:26:47 -0000
Weeds small amounts, ngotor2in paru2.. RT @ajeskoagogo: Vitamins and minerals small amounts, large effect.
Vitamins and minerals small amounts, large effect. http://myloc.me/1kN8k
ajeskoagogo (rais hakiem anwar) Wed, 04 Nov 2009 14:15:13 -0000
Vitamins and minerals small amounts, large effect. http://myloc.me/1kN8k
[Must Read Articles] Codex Alimentarius The Plan To Ban free trade of all Vitamins, Minerals, Herbs and Supplem.. http://bit.ly/2rRnvr
top107 (top107) Wed, 04 Nov 2009 12:57:17 -0000
[Must Read Articles] Codex Alimentarius The Plan To Ban free trade of all Vitamins, Minerals, Herbs and Supplem.. http://bit.ly/2rRnvr
@RyanPinnick what about other vitamins and minerals?
leornoham (Leor Noham) Wed, 04 Nov 2009 12:12:50 -0000
@RyanPinnick what about other vitamins and minerals?
Vitamins And Minerals http://bit.ly/12FN2Z
wellnessgeek (David Winnie) Wed, 04 Nov 2009 11:50:20 -0000
Vitamins And Minerals http://bit.ly/12FN2Z
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