Name/Title
Chalcopyrite / DolomiteEntry/Object ID
78.62.263Description
Chemical Composition: FeS2
Crystal System: Cubic or Isometric S
Description: Common Name: Pyrite conglomerate
Chemistry: FeS2
Class Name:Sulfides
Location: Joplin,Missouri
Description: (Delmar) This piece of ore is from Joplin,Missouri. It is a mix of Pyrite, Dolomite,Chalcopyrite,Copper and Lead on a Chert base.Colors: Grey and white Chert with some ochre stains, pink Dolomite, metalic gold Pyrite, metalic Chalcopyrite with rainbow sheen, some green copper and grey lead. Also some sphalerite is seen.
PHYSICAL CHARACTERISTICS: Color is brassy yellow. Luster is metallic. Transparency: Crystals are opaque. Crystal System is isometric; bar 3 2/m Crystal Habits include the cube, octahedron and pyritohedron (a dodecahedron with pentagonal faces) and crystals with combinations of these forms. Good interpenetration twins called iron crosses are rare. Pyrite is commonly found in nodules. A flattened nodular variety called "Pyrite Suns" or "Pyrite Dollars" is popular in rock shops. Also massive or reniform and replaces other minerals and fossils forming pseudomorphs or copies. Cleavage is very indistinct. Fracture is conchoidal. Hardness is 6 - 6.5 Specific Gravity is approximately 5.1+ (heavier than average for metallic minerals) Streak is greenish black. Other Characteristics: Brittle, striations on cubic faces caused by crossing of pyritohedron with cube. (note - striations on cube faces also demonstrate pyrite's lower symmetry). Pyrite (unlike gold) is not malleable. Associated Minerals are quartz, calcite, gold, sphalerite, galena, fluorite and many other minerals. Pyrite is so common it may be quicker to name the unassociated minerals. Notable Occurrences include Illinois and Missouri, USA; Peru; Germany; Russia; Spain; and South Africa among many others. Best Field Indicators are crystal habit, hardness, streak, luster and brittleness - See more at: http://www.galleries.com/Pyrite#sthash.ItJfn92g.dpuf
Fracture: Conhoidal
Hardness: 6 Orthoclase
Luster: Metallic
Rock Type: Sedimentary
Specific Gravity: 5+
Streak: Greenish blackCollection
Delmar Smith Mineral CollectionDimensions
Width
6-7/16 inDepth
3-1/2 inLength
10 inDimension Notes
Dimension taken at widest pointsLocation
Location
Shelf
CS-F-7Room
Curation StorageBuilding
Crater Rock MuseumCategory
StorageMoved By
CuratorDate
February 16, 2024