Name/Title
Iron / FluoriteEntry/Object ID
78.62.181Description
Chemical Composition: Fe2O3
Crystal System: Triclinic System
Description: Common Name: Iron/ Fluorite
Chemistry for iron/Hematite:Fe2O3
Class:Oxides
Location: Mexico
Description: Delmar described this specimen as a piece of ochre colored Iron with Fluorite crystals from a mine in Mexico. Colors:Ochre and Brown drusy quartz crystals and small gray Fluorite crystals.
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: 5 Apatite
Luster: Vitreous
Rock Type: Sedimentary
Specific Gravity: 5.3
Streak: Brownish redCollection
Delmar Smith Mineral CollectionAcquisition
Accession
78.62Source or Donor
Delmar Smith Mineral CollectionAcquisition Method
DonationDimensions
Width
4-1/2 inDepth
3 inLength
6 inDimension Notes
Dimension taken at widest pointsLocation
Location
Shelf
CS-D-1Room
Curation StorageBuilding
Crater Rock MuseumCategory
StorageMoved By
Curtis GardnerDate
December 19, 2023Location
Cabinet
G-1 rearWall
NorthBuilding
Storage (old gift shop upstairs)Category
Permanent