Name/Title
Tree FernEntry/Object ID
05.58.196 (A)Description
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Osmundaceae
Genus: Osmundacaulis
Common name: Manfern
Age: Early Cretaceous
Location data: Lune River, Tasmania, Australia
Description: This specimen is the two sides of a cut piece the polished slabs are colored grey, black, yellow and red. The growth rings are apparent.
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
05.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 2005.58.196(a)Dimensions
Width
4-1/2 inDepth
1-1/2 inLength
5-1/4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Shelf
2nd left on right, 2nd left on rightWall
EastRoom
Wood roomBuilding
Mentzer Hall - Petrified Wood RoomCategory
PermanentMoved By
Catherine BoydDate
March 6, 2008Location
Container
RightDrawer
2nd ShelfShelf
LeftCabinet
Case #104Wall
East WallBuilding
Mentzer Hall - Petrified Wood RoomCategory
Permanent
