Name/Title
GarnetEntry/Object ID
78.62.105Description
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: WhiteCollection
Delmar Smith Mineral CollectionAcquisition
Accession
78.62Source or Donor
Delmar Smith Mineral CollectionAcquisition Method
DonationDimensions
Width
2 inDepth
1-1/4 inLength
1-1/4 inLocation
Location
Shelf
CS-E-1Room
Curation StorageBuilding
Crater Rock MuseumCategory
StorageMoved By
CuratorDate
February 23, 2024