Name/Title
Petrified WoodEntry/Object ID
07.58.10 (D)Description
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Araucaraceae
Genus: Araucarioxylon
Common name: 5 small branches of Araucaria (w/o growth rings)
Age: Triassic
Location data: Malagasy Republic, Africa
Description: 1 of 5 branches (C) outer is a tan color, both ends are polished and show brownish-red, beige and tan tones with slight growth rings
Size: .750"x .875"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
07.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 2007.58.10 (D)Dimensions
Width
7/8 inDepth
1-1/2 inLength
3/4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Container
LeftDrawer
Bottom / Front RowShelf
RightCabinet
Case#104Wall
East WallBuilding
Mentzer Hall - Petrified Wood RoomCategory
Permanent
