Name/Title
ThundereggEntry/Object ID
2008.1.17Description
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Medium slab of thunderegg
Common Name: Thunderegg
Age:
Location data: Near Burns Oregon USA
Description: Polished slice, colors greenish-tan, red to pink, beige, white and clear
Size: 11" X 10.5" width 2/3"
Type of Fossils Present: None
Grain Size: Fine
Hardness: 7 Quartz
Luster: Glassy
Occurrence: Thundereggs are only found in areas of previous volcanic activity . As silicic lavas poured out on the ground, the gasses made it frothy and bubbly . The lava cooled and over a period of millions of years, became buried . Water, which contains many minerals including silica, penetrated the gas pockets through a crack in the nodule. As water slowly dissipated, the solution deposited agate ( chalcedong SiO2 ) .
Pressure: Moderate
Rock Color: Medium
Rock Origin: Terrestrial
Rock Type: Sedimentary
Specific Gravity: 2.6
Surface Process: Not apparent
Temperature: Moderate
Texture: microcrystaline
Variety: Thundereggs are spherical masses of rock that range in size from less than an inch to four feet in diameter . Most are about the size of a baseball . They have a knobby rind of drab , siliceous rock and a cavity filled with agate . From the out side they appear nondescript , but when sawed open and polished they may reveal the most exquisite and colorful designs ranging from five-pointed stars to miniature gardens .Collection
Oren Kellenbeck CollectionAcquisition
Accession
2008.1Source or Donor
Oren Kellenbeck CollectionAcquisition Method
GiftOther Names and Numbers
Other Number
Other Number: 2008.1.17Dimensions
Dimension Notes
Dimension taken at widest pointsLocation
Location
Cabinet
ToteBuilding
Storage (old gift shop upstairs)Category
PermanentLocation
Container
RightDrawer
2nd shelfShelf
Left side, Left sideWall
Northeast wallRoom
Main Room, Mentzer HallBuilding
Crater Rock MuseumCategory
Permanent
