File:Native copper in phyllite (late Precambrian; Blue Ridge Summit, Adams County, Pennsylvania, USA) 1.jpg
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| Description |
English: Copper from the Precambrian of Pennsylvania, USA. (~10.5 centimeters across at its widest)
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 5500 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. 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 as minerals. Copper is the only metallic element that has a "reddish" color - it’s actually a metallic orange color. Most metallic elements, apart from gold & copper, are silvery-gray colored. Copper tends to form sharp-edged, irregular, twisted masses of moderately high density. It is moderately soft, but is extremely difficult to break. It has no cleavage and has a distinctive hackly fracture. The specimen seen here is native copper filling fractures in greenish-gray phyllite host rock. The literature refers to the host rocks as late Precambrian-aged metavolcanics, either metarhyolite or metabasalt. The green is malachite, a copper carbonate mineral. Locality: unrecorded/undisclosed site at or near the town of Blue Ridge Summit, attributed to southwestern Adams County, southern Pennsylvania, USA Photo gallery of copper: www.mindat.org/gallery.php?min=1209 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/49943633287/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49943633287. It was reviewed on 12 February 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 06:20, 12 February 2022 | | 3,532 × 2,090 (7.2 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49943633287/ with UploadWizard |
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