graphite photos on Flickr

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.

img818 by Liliia Yildirim

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sketchbook Girl in jeans by herselfsurprised

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coloured pencil, graphite

Graphite Blue. by Lucas de Graaf

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Thought as We Know It by JimFromIowa

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Roughly 8 x 10.5 inches

KateQ67 for JKPP by Kim Schuster

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Graphite

2017 01 02 graphite birds on rocks v2 by Liliia Yildirim

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Graphite Grey P1 085 by McLaren San Francisco

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Skeleton day #figuredrawing #graphite #art #drawing #sketch #fineartstudent #contourlines #skeleton by Amanda Blanchard

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unfinished

Self portrait by t s

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Graphite

LP Pregnant 5 by Tom Bennett

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ink, graphite, gouache on paper

Strength by Mishu Bogan

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graphite pencil on paper

Graphite by Ron Wolf

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Graphite. South Lapis-Lazuli Occurance. Soper River, Kimmirut, Nunavut, Canada.

2015 Ford Mustang GT 50th Anniversary Pack | 20" Vossen CVT Gloss Graphite - © Vossen Wheels 2015 - 1034 by Vossen Wheels

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2015 Ford Mustang GT 50th Anniversary Pack on 20" Gloss Graphite CVT

Front: 20x9 +20

Rear: 20x10.5 +45

Roush Performance Exhaust

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depression by Rick&Brenda Beerhorst

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graphite drawing with water color

img498 by Liliia Yildirim

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Water-soluble graphite pencils.

JR37 Gloss Graphite by JR-Wheels

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21x10,5

Custer's Sin by JimFromIowa

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Roughly 5 x 8 inches. A relative of Dirty Blue Fulfillment. It's not General Custer, either. It's the Custer who led the Fulfillment Seminar, as it was called in the brochure I found in a discarded book I bought at a thrift shop.

Graphite by kristen t. cates

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This was so incredibly hard to take/edit, and it took forever. Yet I still feel very uneasy about uploading it.

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South Texas Radiology and Imaging Center by JZaidel