Name/Title
Casa Grande AgateEntry/Object ID
1986.62.17Description
Chemical Composition: SiO2
Crystal System: Orthorhombic System
Description: Common Name: Quartz var. agate (casa grande)
Chemistry: SiO2
Group: Silicates
Location: Chihuahua, Mexico
Description: Semi-smooth, irregular back with large cavity and polished face. Slightly green and gray matrix with purple and lavender bands and translucent blue-gray.
PHYSICAL CHARACTERISTICS:
Agate ( /'æg?t/) is a microcrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks.
Fracture: conchoidal
Hardness: 7 Quartz
Luster: Waxy
Rock Type: Sedimentary
Specific Gravity: 2.58-2.64
Streak: white
Texture: MircocrystallineCollection
Mexican Agate CollectionAcquisition
Accession
78.59Source or Donor
Delmar Smith Agate CollectionAcquisition Method
GiftDimensions
Width
4 inDepth
1-1/8 inLength
4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
FS-15Room
Frieda Smith HallBuilding
Crater Rock MuseumCategory
PermanentDate
September 5, 2023