Bladed Hematite in Galena

Object/Artifact

-

Crater Rock Museum

Name/Title

Bladed Hematite in Galena

Entry/Object ID

78.63.379

Description

Crystal System: Monoclinic System Description: Common Name: Galena Group Name: Sulfides Location: Italy Chemistry: PbS Description: This specimen has bladed crystals with an irredescense. PHYSICAL CHARACTERISTICS: •Color is lead to silver gray sometimes with a bluish tint. •Luster is metallic to dull in weathered faces. •Transparency crystals are opaque. •Crystal System is isometric; 4/m bar 3 2/m •Crystal Habits include the cube, octahedron and combinations of the two. Spinel twinning is possible forming flattened crystals. Also massive and granular. •Cleavage is perfect in four direction forming cubes. •Fracture is uneven and rarely seen because of the perfect cleavage. •Hardness is 2.5+ •Specific Gravity is approximately 7.5+ (heavy even for metallic minerals) •Streak is lead gray •Associated Minerals are calcite, dolomite, sphalerite, pyrite and other sulfide minerals, also lead oxidation minerals such as cerussite and anglesite. •Other Characteristics: brighter metallic luster on cleavage surfaces than on crystal faces. •Notable Occurances include Texas-Oklahoma-Missouri area, USA; Germany, Peru, Mexico, Zambia, and England. •Best Field Indicators are crystal habit, cleavage and, perhaps most importantly, density. Fracture: uneven Hardness: 2 Gypsum Luster: Vitreous Specific Gravity: 2.8 Streak: white

Collection

Suomynona Collection

Acquisition

Accession

78.63

Source or Donor

Delmar Smith Crystal Collection

Acquisition Method

Donation

Dimensions

Height

3 in

Width

1-1/2 in

Length

2 in

Dimension Notes

Dimension taken at widest points

Location

Location

Display Case

FS-11

Room

Frieda Smith Hall

Building

Crater Rock Museum

Category

Permanent

Moved By

Curtis Gardner

Date

May 25, 2023

Notes

Added current location