Name/Title
HematiteEntry/Object ID
2004.1.166Description
Chemical Composition: Fe2O3
Crystal System: Tetragonal System
Description: Common Name: Hematite, in botryoidal form
Chemistry: Fe2O3
Group: Oxides
Location: Missouri USA
Description: Metallic colored, dark gray. Small spheres all bunched together in botryoidal form and giving the appearance of lumpy grape-like masses.
PHYSICAL CHARACTERISTICS:
Color is steel or silver gray to black in some forms and red to brown in earthy forms. Sometimes tarnished with iridescent colors when in a hydrated form (called Turgite).
Luster is metallic or dull in earthy and oolitic forms.
Transparency: Crystals are opaque.
Crystal System is trigonal; bar 3 2/m
Crystal Habits include tabular crystals of varying thickness sometimes twinned, micaceous (specular), botryoidal and massive. also earthy or oolitic.
Cleavage is absent. However, there is a parting on two planes.
Fracture is uneven.
Hardness is 5 - 6
Specific Gravity is 5.3 (slightly above average for metallic minerals)
Streak is blood red to brownish red for earthy forms.
Associated Minerals include jasper (a variety of quartz) in banded iron formations (BIF or Tiger Iron), dipyramidal quartz, rutile, and pyrite among others.
Best Field Indicators are crystal habit, streak and hardness
Fracture: Uneven
Hardness: 5 Apatite
Luster: Metallic
Occurrence: Huge deposits of hematite are found in banded iron formations. Grey hematite is typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone National Park in the United States. The mineral can precipitate out of water and collect in layers at the bottom of a lake, spring, or other standing water. Hematite can also occur without water, however, usually as the result of volcanic activity.
Clay-sized hematite crystals can also occur as a secondary mineral formed by weathering processes in soil, and along with other iron oxides or oxyhydroxides such as goethite, is responsible for the red color of many tropical, ancient, or otherwise highly weathered soils.
Rock Type: Sedimentary
Specific Gravity: 5.3
Streak: Blood red
Texture: MIcrocrystaline
Variety: Hematite has several varieties, each with their own unique names.
Hematite Rose is a circular arrangment of bladed crystals giving the appearance of the flower of a rose.
Tiger Iron is a sedimentary deposit of approximately 2.2 billion years old that consists of alternating layers of silver gray hematite and red jasper, chert or even tiger eye quartz.
Kidney Ore is the massive botryoidal form and gives the appearance of lumpy kidney-like masses.
Oolitic Hematite is a sedimentary formation that has a reddish brown color and an earthy luster and is composed of small rounded grains.
Specularite is a micaceous or flaky stone that is sparkling silver gray and sometimes used as an ornamental stoneCollection
Suomynona Mineral CollectionAcquisition
Accession
2004.1Source or Donor
Suomynona Mineral CollectionAcquisition Method
DonationDimensions
Width
4-1/2 inDepth
2-3/8 inLength
5 inWeight
0.33 ozDimension Notes
Dimension taken at widest pointsLocation
Location
Container
LeftDrawer
2nd ShelfShelf
Left, LeftWall
NorthBuilding
Founders RoomCategory
PermanentMoved By
Ray BlohmDate
February 20, 2012Location
Shelf
LeftCabinet
Case # 7Room
Mentzer HallBuilding
Crater Rock MuseumCategory
Permanent
