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Graphite from Ceylon (Sri Lanka).
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.
Locality: unrecorded / undisclosed site in Ceylon / Sri Lanka (attributed to "Colombo")
Item Number:6704-60-sh1
Document Title:PLAN OF FIRST FLOOR/ ; SCALE 1/4"= 1'
Project:06704; Hornblower, Henry; Plimouth Plantat. --Greenough, see -- --; Plymouth; Massachusetts; 07 Private Estate & Homesteads; 39 PLANS ()
Location:Olmsted National Historic Site, Brookline, MA
Category:PLAN
Purpose:A&E (Architectural & Engineering)
Physical Characteristics:13.5 x 30.75 cyano neg ink --graphite paper
Dates:31-OCT-1923
Notes:Mrs. H.H. Meyer House, P/I/ Sheet 3 Destroyed P/I/ (Notes in graphite.)/ Void use 64, P/I/ Rec'd from W.W. Dinemoor, 28 School St. Boston, P/I/ (Sketch on verso.)/ John Woods verso/ ( This plan was labeled sh3, but a sh3 already exists so it was labeled sh1 to differentiate it from the other.)
Please credit: Courtesy of the United States Department of the Interior, National Park Service, Frederick Law Olmsted National Historic Site.
Graphite on paper. I have to get a better scanner; my crappy cheap CIS scanner just isn't cutting the mustard. The trouble is, every time I think I might be able to afford a new one, another bill arrives. I hate that.
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Some of the artwork at this winter's gallery at Graphite Art Center on March 4, 2023.
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