Petrified Wood

Object/Artifact

-

Crater Rock Museum

Name/Title

Petrified Wood

Entry/Object ID

07.58.58

Description

Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Juglandaceae Genus: Juglands Common name: Walnut Age: Pliocene Location data: Colorado River near Martinez Lake, Arizona Description: Uncut to show well preserved outer wood structure, including knotholes (specimen was driftwood) that had eroded at both ends before petrifiying. Size: 8.500"x 5.500"x 3.500" Type of Fossils Present: Plants Fracture: conchoidal Grain Size: Fine Hardness: 7 Quartz Luster: Glassy Occurrence: Silicified wood, which is the fossilization and/or 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 volcanic related mudflow. The organic material in the wood is then replaced by silica, other minerals determined the colors of the petrified wood. 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: microcrystaline Variety: Petrified wood is hydrous microcrystalline variety of quartz that can be defined in general term of chalcedony

Collection

Petrified Wood Collection

Acquisition

Accession

07.58

Source or Donor

Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 07.58.58

Dimensions

Width

5-1/2 in

Depth

3-1/2 in

Length

8-1/2 in

Dimension Notes

Dimension taken at widest points

Location

Location

Drawer

Center

Shelf

Bottom

Cabinet

Case#112(c)

Wall

North

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent