Petrified Bark (rare)

Object/Artifact

-

Crater Rock Museum

Name/Title

Petrified Bark (rare)

Entry/Object ID

07.58.13

Description

Chemical Composition: Si O2 Crystal System: Hexagonal Description: Age: Miocene Location data: Bruno, Idaho USA Glenns Ferry fm. Description: Chunk of bark colors range from tans to browns. **Petrified bark is rare because bark is easily separated from a tree. In most cases the bark from the trees was abraded away when the trees were tossed, tumbled and carried by rivers to their final resting place and then buried by sediments. If these sediments consisted of volcanic ash or other silica-rich material, wood form the tree could eventually become petrified. So to preserve bark, a tree must be downed and buried very quickly. The small chunk of petrified bark from Bruno, Idaho is 3.9 million years old. Size: 1.00"x 1.00"x 2.675" 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

07.58

Source or Donor

Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 2007.58.13

Dimensions

Width

1 in

Depth

2-11/16 in

Length

1 in

Dimension Notes

Dimension taken at widest points

Location

Location

Shelf

2nd left on right si, 2nd left on right si

Wall

right - south

Room

Wood room

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent

Moved By

Catherine Boyd

Date

April 30, 2008

Location

Container

Center

Drawer

2nd Shelf

Shelf

Left

Cabinet

Case #101

Wall

South wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent