Garnet

Object/Artifact

-

Crater Rock Museum

Garnet

Garnet

Name/Title

Garnet

Entry/Object ID

78.62.105

Description

Chemical Composition: Fe3AI2(SiO4)3 Crystal System: Orthorhombic System Description: Common Name: Garnet Chemistry: Fe3Al2(SiO4)3 Group: Silicates Location : Jackson County, Oregon Description: A mass of Garnet crystals in quartz. Colors : Black Garnet with gray quartz and some ochre iron stain. Also some white rock with ochre seen. Physical Charateristics: •Color is white, colorless or yellow; rarely blue. Hematite inclusions may color specimens reddish. •Luster is vitreous to greasy, resinous or dull. •Transparency: Crystals are transparent to translucent. •Crystal System is orthorhombic; 2/m 2/m 2/m. •Crystal Habits are typically granular and massive, sometimes fibrous. Individual crystals are rare, but when seen are pseudo-hexagonal and tabular. •Cleavage is absent. •Fracture is conchoidal. •Hardness is 2.5 •Specific Gravity is approximately 1.6 (light even for translucent minerals). •Streak is white. •Other Characteristics: Bitter taste, deliquescent (meaning it can absorb water from the air), fluorescent and can color a flame violet (due to potassium). •Associated Minerals include halite, anhydrite, dolomite, gypsum, kainite, kieserite, polyhalite, sylvite and other more rare potassium evaporite minerals. •Notable Occurrences include Carlsbad, New Mexico; Western Texas; Colorado and Utah, USA; Strassfurt, Germany; Ural Mountains, Russia; Iran; China; Tunisia; Spain; Mali; Ukraine and Saskatchewan, Canada. •Best Field Indicators are environment of formation, lack of cleavage, associations, density, deliquescence, fracture and taste. Fracture: Conchoidal Hardness: 3 Calcite Luster: Vitreous Rock Type: Sedimentary Specific Gravity: 1.6 Streak: White

Collection

Delmar Smith Mineral Collection

Acquisition

Accession

78.62

Source or Donor

Delmar Smith Mineral Collection

Acquisition Method

Donation

Dimensions

Width

2 in

Depth

1-1/4 in

Length

1-1/4 in

Location

Location

Shelf

CS-E-1

Room

Curation Storage

Building

Crater Rock Museum

Category

Storage

Moved By

Curator

Date

February 23, 2024