Walnut

Object/Artifact

-

Crater Rock Museum

Name/Title

Walnut

Entry/Object ID

05.58.132

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Juglandaceae Genus: Juglans Common Name: Walnut Age: Miocene Location data: Stinking Water Mountain, Oregon Description: Thin slab with polished face. Thick beige and tan outer band with a light tan, beige, creamy yellow and black inner area. Growth rings are visible. Type of Fossils Present: Plants Fracture: conchoidal Grain Size: Fine Hardness: 7 Quartz Luster: Glassy Occurrence: Silicified wood, which is the fossilization and/or 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 volcanic related mudflow. The organic material in the wood is then replaced by silica, other minerals determined the colors of the petrified wood. Pressure: Moderate Rock Color: Medium Rock Origin: Post-depositional Rock Type: Sedimentary Specific Gravity: 2.6 Surface Process: Not apparent Streak: white Temperature: Low Texture: microcrystalline Variety: Petrified wood is hydrous microcrystalline variety of quartz that can be defined in general term of chalcedony or opalization

Collection

Petrified Wood Collection

Acquisition

Accession

05.58.

Other Names and Numbers

Other Number

Other Number: 05.58.132

Dimensions

Width

8 in

Depth

3/4 in

Length

13-1/2 in

Dimension Notes

Dimension taken at widest points

Location

Location

Display Case

PW-1

Room

Petrified Wood Room

Building

Crater Rock Museum

Category

Exhibit

Moved By

Jillian Mather Kettley

Date

January 14, 2025

Notes

Inventory/Locating