Name/Title
Hematite var. kidney oreEntry/Object ID
2016.1.1Description
Chemical Composition: SiO2
Crystal System: Hexagonal System
Description: Common name: Botryoidal Hematite
Composition : Fe203
Group: Oxides
Location: Morocco
Description: This is a botryoidal hematite with one side showing extensive bubbling.
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.
Notable Occurrences especially nice specimens come from England, Mexico, Brazil, Australia and the Lake Superior region.
Best Field Indicators are crystal habit, streak and hardness.
Fracture: Uneven
Hardness: 7 Quartz
Luster: Vitreous
Rock Type: Metamorphic
Specific Gravity: 5.3
Streak: Blood red to brown
Variety: Hematite has several varieties, each with their own unique names.
Hematite Rose is a circular arrangement 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
RAGM Mineral CollectionDimensions
Height
1-3/4 inWidth
2-3/4 inLength
3-1/2 inLocation
Location
Shelf
Bottom-cubby, Bottom-cubbyRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Rawley WyattDate
July 16, 2015Location
Room
storage (donation room)Building
Storage (Donation Room)Category
PermanentLocation
Shelf
table top, table topRoom
above fossil room, Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
ASGLocation
Shelf
table top, table topRoom
above fossil roomBuilding
Deassessioned Storage (Donation Room)Category
PermanentMoved By
ASG
