Crocoite

Object/Artifact

-

Crater Rock Museum

Crocoite

Crocoite

Name/Title

Crocoite

Entry/Object ID

2009.62.237

Description

Common Name: Crocoite (Lead Chromate) Chemistry:PbCrO4 Class:Sulfates Subclass:Chromates Group: Location:Red Lead Mine,Dundas,Tasmania DESCRIPTION: Two pieces with randomly strewn course slivers of crystal, 1/2" to 1". Color is a pinkish red. Crystals are tightly bunched in a sparse, tan colored granular matrix. These are labled A&B. Physical Characteristics: Color is bright orange-red to yellowish-red. • Luster is adamantine to greasy. • Transparency: Crystals are translucent to transparent. • Crystal System is monoclinic; 2/m • Crystal Habits include prismatic crystals somewhat square in cross-sections, often striated lengthwise. Terminations are usually poorly developed and appear uneven or pitted. Also, granular and columnar. • Cleavage is distinct in two directions lengthwise, prismatic. • Fracture is conchoidal and uneven. • Hardness is 2.5 - 3. • Specific Gravity is approximately 6.0+ (very heavy for translucent minerals) • Streak is orange-yellow. • Other Characteristics: Index of refraction is a very high 2.36 • Associated Minerals are wulfenite, pyromorphite, cerussite, limonite and vanadanite. • Notable Occurrences include Dundas District, Tasmania, Australia; Ural Mountains, Russia and Inyo and Riverside Counties in California, USA. • Best Field Indicators are crystal habit, locality, density, high luster and color.

Collection

RAGM Mineral Collection

Acquisition

Accession

2009.62

Source or Donor

Museum Collection of Minerals

Acquisition Method

Donation

Other Names and Numbers

Other Number

2009.62.237 A&B

Location

Location

Display Case

DS-10

Room

Delmar Smith Hall

Building

Crater Rock Museum

Category

Permanent

Moved By

Curtis Gardner

Date

May 9, 2023

Notes

Added current location while cleaning shelf

Location

Building

Storage (old gift shop upstairs)&Delmar Smith Hall

Category

Permanent