Elm O

Object/Artifact

-

Crater Rock Museum

Name/Title

Elm "O"

Entry/Object ID

05.58.85

Description

Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family : Not Identified Age: Unknown Location data: Unknown Description: Complete round with missing center, polished face shows growth ring with brown, tan and white. Outer shows reddish brown bark surface. Inner circle or center shows a tan wood surface 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: Light 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

05.58

Source or Donor

Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 2005.58.85

Dimensions

Width

6-1/2 in

Depth

2-1/4 in

Length

6-3/4 in

Dimension Notes

Dimension taken at widest points

Location

Location

Container

Center

Drawer

Bottom

Shelf

Right

Cabinet

Case #101

Wall

South wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent