Birch

Object/Artifact

-

Crater Rock Museum

Name/Title

Birch

Entry/Object ID

04.58.6

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Betulaceae Genus: Betula Common name: Birch Age: Cenozoic: Oligocene Location data: Sweethome, Oregon Description: Foot long section of a log trunk where it emerged from ground. Reddish to tan outside. Highly agatized, colored grey and white center, nearly completely surrounded by a band of white agate. Brown and tan on most of the outside edges. Type of Fossils Present: Plants Grain Size: Fine Hardness: 7 Quartz Luster: Glassy Occurrence: Silicified wood, which is the fossilization and opalization of organic woody matter by the deposation 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. Pressure: Low-Moderate Rock Color: Medium Rock Origin: Terrestrial Rock Type: Sedimentary Specific Gravity: 2.6 Surface Process: Not apparent Temperature: Low Texture: microcrystalline Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony or opal.

Collection

Petrified Wood Collection

Acquisition

Accession

04.58

Source or Donor

Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 04.58.6

Dimensions

Width

4-3/4 in

Depth

4 in

Length

10-3/4 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Container

Center

Drawer

Bottom

Shelf

Right

Cabinet

Case #108

Wall

North Wall

Building

Mentzer Hall- Petrified Wood Room

Category

Permanent