page_title: Nonesuch Shale
hierarchical_section_title: Nonesuch Shale
caption_attribution_description: Native copper-replaced cross-bedded sedimentary rocks from the Precambrian of Michigan, USA. (CMNH 20309, Cleveland Museum of Natural History, Cleveland, Ohio, USA) A mineral is a naturally-occurring, solid, inorganic, crystalline substrance 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 4900 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 &amp; 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 &amp; 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 unbelievable copper specimen shown above comes from northern Michigan's White Pine Mine, which is developed in the Precambrian-aged Nonesuch Shale (~1.07 to 1.08 Ga). At this mine, native copper is usually encountered filling fractures (joints). This large, 70-pound specimen represents actual sedimentary rock that has been replaced by native copper. The irregular layers are crossbeds, which formed as the original sediments were deposited by a one-directional current. The small black-colored patches are bits of the unaltered sedimentary host rock. White Pine Mine copper mineralization occurred at 1.05 to 1.06 billion years ago. Stratigraphy: lower Nonesuch Shale (near the contact with the Copper Harbor Conglomerate), late Mesoproterozoic, ~1.07-1.08 Ga Locality: near the southwestern shaft at the 2500 foot level, White Pine Mine, Upper Peninsula of Michigan, USA
context_page_description: The Nonesuch Shale is a Proterozoic geologic formation that outcrops in Michigan and Wisconsin, United States, but has been found by drill holes to extend in the subsurface as far southwest as Iowa.
  The Nonesuch is a lacustrine sequence of shale, siltstone, and sandstone, 150 to 210 m thick, that conformably overlies the alluvial Copper Harbor Conglomerate and is conformably overlain by the fluvial Freda Sandstone. Together, the Copper Harbor, Nonesuch, and Freda make up the Oronto Group. The Nonesuch is Middle Proterozoic, with an estimated age of approximately 1.1 billion years. It was deposited in the Midcontinent Rift. The Nonesuch beds contain common organic carbon and pyrite.
context_section_description: The Nonesuch Shale is a Proterozoic geologic formation that outcrops in Michigan and Wisconsin, United States, but has been found by drill holes to extend in the subsurface as far southwest as Iowa.
  The Nonesuch is a lacustrine sequence of shale, siltstone, and sandstone, 150 to 210 m thick, that conformably overlies the alluvial Copper Harbor Conglomerate and is conformably overlain by the fluvial Freda Sandstone.  Together, the Copper Harbor, Nonesuch, and Freda make up the Oronto Group.  The Nonesuch is Middle Proterozoic, with an estimated age of approximately 1.1 billion years.  It was deposited in the Midcontinent Rift.  The Nonesuch beds contain common organic carbon and pyrite.
caption: Native copper replaces cross-bedded sedimentary rocks of the Nonesuch Shale, White Pine mine, Upper Peninsula of Michigan
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