Iron/Hematite

Object/Artifact

-

Crater Rock Museum

Name/Title

Iron/Hematite

Entry/Object ID

78.62.231

Description

Chemical Composition: Fe2O3 Crystal System: Triclinic System Description: Common Name: Iron/Hematite Chemistry for iron/Hematite:Fe2O3 Class:Oxides Location: Mexico Description: Delmar described this specimen as a large, thin piece of Iron with Hematite crystals from a mine in Mexico. Colors:Ochre and Brown crystals. Iron with white and brown stained crystals of Hematite. 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 red

Collection

Delmar Smith Mineral Collection

Acquisition

Accession

78.62.231

Dimensions

Width

11-3/4 in

Depth

1-3/4 in

Length

7 in

Dimension Notes

Dimension taken at widest points

Location

Location

Shelf

CS-E-1

Room

Curation Storage

Building

Crater Rock Museum

Category

Storage

Moved By

Curator

Date

February 23, 2024