Name/Title
Petrified WoodEntry/Object ID
05.58.199Description
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Fagaceae
Genus: Quercus
Common Name: Oak
Age: Eocene to Miocene
Location data: ?Oregon
Description: Cut longitudinally polished face shows colors of tan, beige, rust and brown, woods grain is apparent, outer side shows a woody bark appearance with colors beige, brown and rust.
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: Microcrystalline
Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony.Collection
Petrified Wood CollectionAcquisition
Accession
05.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 2005.58.199Dimensions
Width
4-1/2 inDepth
1 inLength
22-1/2 inDimension Notes
Dimension taken at widest pointsLocation
Location
Shelf
bottom rightRoom
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
Permanent
