Gourt > Health > Conditions and Diseases > Nutrition and Metabolism Disorders > Vitamins and Minerals (10)
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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Vitamins and Minerals :: Nutrients
@whitney8612 what u havent had nasty till u had luck warm refeshing project sink water ohh the vitamins and minerals it has
djkevwhite ( kev white) Fri, 06 Nov 2009 16:53:36 -0000
@whitney8612 what u havent had nasty till u had luck warm refeshing project sink water ohh the vitamins and minerals it has
Latest Free Article: Vitamins And Minerals That Are Depleted By The Prescription Drugs You Take http://tinyurl.com/yhc7zk9
RanaMarketing (Rana Marketing) Fri, 06 Nov 2009 16:45:14 -0000
Latest Free Article: Vitamins And Minerals That Are Depleted By The Prescription Drugs You Take http://tinyurl.com/yhc7zk9
Are you low in energy? Likely that you are lacking certain vitamins and minerals. Check out this solution http://bit.ly/viGUA
davesheahan1 (dave Sheahan) Fri, 06 Nov 2009 15:40:54 -0000
Are you low in energy? Likely that you are lacking certain vitamins and minerals. Check out this solution http://bit.ly/viGUA
@rockdrool absolutely ! it has all those vitamins and minerals... like... well theres just too many to list!
ComplicatedMama (Complicated Mama) Fri, 06 Nov 2009 15:38:39 -0000
@rockdrool absolutely ! it has all those vitamins and minerals... like... well theres just too many to list!
a gut full of fish, chips and beer - vital vitamins and minerals for growing a Mo #movember
weggy1978 (Andrew) Fri, 06 Nov 2009 15:23:17 -0000
a gut full of fish, chips and beer - vital vitamins and minerals for growing a Mo #movember
they sell a version of diet coke with some kind of "added vitamins and minerals" or something. why does this make it seem LESs healthy? ew
twotimingpete (Matt White) Fri, 06 Nov 2009 15:16:36 -0000
they sell a version of diet coke with some kind of "added vitamins and minerals" or something. why does this make it seem LESs healthy? ew
An FDA Guide to Dietary Supplements - A framework for FDA regulation of dietary supplements, requiring consumers, as well as manufacturers, to be responsible for checking the safety of these products and determining the truthfulness of their label claims.
Meta Description: [ The 1994 Dietary Supplement Health and Education Act, which set up a new framework for FDA regulation of dietary supplements, requires consumers, as well as manufacturers, to be responsible for checking the safety of these products and determining the truthfulness of their label claims. ]
Consensus Statement on Optimal Calcium Intake Published in JAMA - Answers all questions about the intake of calcium from birth on through each age.
Meta Description: [ This is the homepage for the U.S. government's National Institute of Arthritis and Musculoskeletal and Skin Diseases, a component of the U.S. Department of Health and Humans Services' National Institutes of Health. ]
Introduction to Coenzyme Q10 - Peter H. Langsjoen, M.D., F.A.C.C. gives a definition, history, deficiency, frequently asked questions and the future of this vitamin.
Linus Pauling Lectures on Vitamin C and Heart Disease - Two-time Nobel laureate and the world's foremost vitamin C proponent. An article about the man and the vitamin.
Magnesium Deficiencies - Reviews Mitral Valve Prolapse as a symptom of a magnesium deficiency as well as Anxiety and Psychiatric Disorders, Asthma, Fibromyalgia, Chronic Fatigue Syndrome and many other disorders.
Meta Description: [ Magnesium: A deficiency of this nutrient may be a common link in asthma, allergies, anxiety disorders, ADD and more. ]
Magnesium: We Don't Appear To Be Getting Enough - Science News Online: A look at the different uses for this mineral such as for high blood pressure, headaches and what foods to find this mineral in.
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