Petrified Wood

Object/Artifact

-

Crater Rock Museum

Name/Title

Petrified Wood

Entry/Object ID

78.58.438

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Genus: Common Name: Limb Cast Age: Miocene Location data: Nigger Rock, Owyhee, Oregon Description: Polished end shows wood in golden brown, yellow, grey and red, some black. Growth rings are visible. Size: 1.750"x 2.500"x 2.00" 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: 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 wood is hydrous microcrystalline variety of quartz that can be defined in general term of chalcedony or opalization

Collection

Petrified Wood Collection

Acquisition

Accession

78.58.

Other Names and Numbers

Other Number

Other Number: 78.58.438

Dimensions

Width

2-1/2 in

Depth

2 in

Length

1-3/4 in

Dimension Notes

Dimension taken at widest points

Location

Location

Container

Center

Drawer

3rd Shelf

Shelf

Right

Cabinet

Case #111

Wall

South wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent