Name/Title
Petrified WoodEntry/Object ID
07.58.94BDescription
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Mimosaceae
Genus: Acacia
Common name: Acacia
Age: Miocene
Location data: Round Top Mountain near Butte Falls, Jackson Co., Oregon, USA
Description: Cut slab from 07.58.94A colors show light browns, tans and beiges. Notice there are lighter colored worm shaped tunnels on the faces of these specimens.
Size: 6.250"x 3.500"x .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 or opalized.Collection
Petrified Wood CollectionAcquisition
Accession
07.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 07.58.94BDimensions
Width
3-1/2 inDepth
1/2 inLength
6-1/4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Container
LeftDrawer
BottomShelf
LeftCabinet
Case #106Wall
NorthBuilding
Mentzer Hall - Petrified Wood RoomCategory
Permanent
