Oak

Object/Artifact

-

Crater Rock Museum

Name/Title

Oak

Entry/Object ID

05.58.187(a)

Description

Assemblage Zone: Sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family:Fagaceae Genus: Quercus Common Name: Oak Age: Pliocene Location data: Deschutes Canyon, Oregon Description: Thin slab with polished face. Grey, tan and brown in bands on outer areas with a dark brown spot towards the inner area. Streaking visible in a burst pattern coming from the center outwards. 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 Collection

Acquisition

Accession

05.58

Source or Donor

Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 05.58.187(a)

Dimensions

Width

3-1/2 in

Depth

1/4 in

Length

4-1/2 in

Dimension Notes

Dimension taken at widest points

Location

Location

Container

Right

Drawer

Top Shelf

Shelf

Center

Cabinet

Case #112

Wall

North Wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent