View allAll Photos Tagged graphite
Item Number: 176-149
Document Title: -Phillips Academy/profiles/to acc. plan No 146 [r] -profiles of road near day dormitory and walk rear of same to acc #146 [pi]/; -scale Hor 1"=40' / Vert 1"=4' [r]
Project: 00176; Phillips Academy; Andover; Massachusetts; 04 College & School Campuses; 1330 PLANS (1891-1965)
Artist/Creator: OLMSTED BROTHERS LANDSCAPE ARCHITECTS --PETERSON, JHP
Location: Olmsted National Historic Site, Brookline, MA
Category: PLAN
Purpose: P&S (Profile & Section)
Physical Characteristics: 0000012635 11 x 19 ink --color ink --graphite graph
Dates: 25-MAY-1911
Notes: -OB/LA [r] -checked by LS/app for issue/by PG [r] Draftsman = Dr. JHP, Tr. JHP [r], Peterson [pi] PI CAT = P&S
Please credit: Courtesy of the United States Department of the Interior, National Park Service, Frederick Law Olmsted National Historic Site.
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")