Name/Title
SpruceEntry/Object ID
78.58.511Description
Assemblage Zone: Sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Pinaceae
Genus: Picea
Common name: Spruce
Age: Mid-Miocene
Location data: Cedarville, Modoc County, California
Formation: Warner Mt. Basalt
Description: Complete round, tan on the outside, blue-clear botryoidal agate on uncut face; cut face, black and white after bleaching. Tramatic resin cracks (from frost damage) on several outer growth rings.( per Doug Foster)
Size: 2.250"x 1.500"x 1.500"
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Luster: Glassy
Occurrence: Silicified wood, which is the fossilization and opalization of organic woody matter by the deposition of SiO2 in a anaerobic environment to prevent decay. This means that the wood must somehow be buried in an oxygen free enviroment, possibly in the silt-laden river or the bottom of a lake or buried by volcanic ash or related volcanic mudflow. The organic material in the wood is then replaced by silica (SiO2), other minerals determined its colors.
Pressure: Low-Moderate
Rock Color: Medium
Rock Origin: Post-depositional
Rock Type: Sedimentary
Specific Gravity: 2.6
Surface Process: Not apparent
Streak: white
Temperature: Low
Texture: Mircrocrystalline
Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony.Collection
Petrified Wood CollectionAcquisition
Accession
78.58Source or Donor
Delmar Smith Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 78.58.511Dimensions
Width
1-1/2 inDepth
1-1/2 inLength
2-1/4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
PW-1Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
January 14, 2025Notes
Inventory/Locating
