Name/Title
Coyamito AgateEntry/Object ID
1986.62.13Description
Chemical Composition: SiO2
Crystal System: Orthorhombic System
Description: Common Name: Quartz var. agate (coyomito)
Chemistry: SiO2
Group: Silicates
Location: Coyomito Ranch, Chihuahua, Mexico
Description: Smooth, rounded back with polished face. Light and dark brown outer regions with an orange, purple and dark blue inner banded area with a dark gray crystalline cavity in center.
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
1-7/8 inDepth
1-3/8 inLength
4-1/8 inDimension Notes
Dimension taken at widest pointsLocation
Location
Container
CenterDrawer
Top ShelfShelf
left, leftWall
eastBuilding
Frieda Smith HallCategory
PermanentMoved By
Steve MillerDate
August 24, 2011Location
Container
CenterDrawer
Top ShelfShelf
Left, LeftWall
WestBuilding
Frieda Smith HallCategory
PermanentMoved By
Steve MillerDate
August 24, 2011Location
Shelf
LeftCabinet
Case # 51Room
Delmar Smith HallBuilding
Crater Rock MuseumCategory
Permanent