Graphite, Graphite (4.2 centimeters across) A mineral is a …
Graphite (4.2 centimeters across) A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5900 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. Elements are fundamental substances of matter - matter that is composed of the same types of atoms. At present, 118 elements are known (four of them are still unnamed). Of these, 98 occur naturally on Earth (hydrogen to californium). Most of these occur in rocks & minerals, although some occur in very small, trace amounts. Only some elements occur in their native elemental state as minerals. To find a native element in nature, it must be relatively non-reactive and there must be some concentration process. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state. The element carbon principally occurs in its native state as the minerals graphite (C) and diamond (C). Graphite is the common & far less valuable polymorph of carbon. Graphite has a metallic luster and a silvery-gray color. It is very soft (H = 1), has a slick, greasy feel, and readily marks paper. Graphite does have cleavage, but it is not apparent at the hand specimen scale. The ability of graphite to mark paper, its softness, and its greasy feel are all a consequence of cleavage sheets easily slipping over each other on a microscopic scale.
Four gram of graphite is burnt in a bomb calorimeter of heat capacity 30 kJK^-1 in excess of oxyg
Full article: Minerals of Berg Aukas, Otavi Mountainland, Namibia
Origin and depositional history of platinum-group minerals in placers – A critical review of facts and fiction - ScienceDirect
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Chemically Reduced Graphite Oxide with Improved Shape Anisotropy
Activated carbon - Wikipedia
Minerals, Free Full-Text
Minerals, Free Full-Text
Uranium-bearing Graphite: Mineral information, data and localities.
Graphite: Mineral information, data and localities.
A contribution to understanding the flotation behavior of lithium metal oxides and spheroidized graphite for lithium-ion battery recycling - ScienceDirect
Graphite: The mineral Graphite information and pictures
