Petrified Wood

Object/Artifact

-

Crater Rock Museum

Name/Title

Petrified Wood

Entry/Object ID

78.58.9

Description

Assemblage Zone: Sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Leguminosae Genus:Gleditsia Common Name: Honey Locust Location Data: Grassy Mountain, Oregon Description: One piece of petrified wood from Graveyard Point, Oregon. Possibly water fish. Unusual in that is probably as large as a diameter as this species grew. Showing clear annual growth rings. Rare to find a complete section. Colors are predominetly gold, with some greys and browns. Size: 7.250"x 6.250"x .750 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 Temperature: Low Texture: Microcrystalline Variety: Petrified woods ar hydrous microcrystalline varieties of quartz that can be generally termed as chalcedony or opalized .

Collection

Petrified Wood Collection

Acquisition

Accession

78.58

Source or Donor

Delmar Smith Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 78.58.9

Dimensions

Width

6-1/4 in

Depth

3/4 in

Length

7-1/4 in

Dimension Notes

Dimension taken at widest points

Location

Location

Container

Left

Drawer

3rd Shelf

Shelf

Left

Cabinet

Case #111

Wall

South wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent