Name/Title
ThundereggEntry/Object ID
2008.1.14Description
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Large slab Thunderegg
Age:
Location data: Burns, Oregon, USA
Description: Large polished slab,colors reds to pinks to a reddish brown, tans to a tanish green tone, white and clean.
Size: 18.25" X 13" width 1"
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: Weathering
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: 2008.1.14Dimensions
Dimension Notes
Dimension taken at widest pointsLocation
Location
Drawer
Bottom shelfShelf
Right side, Right sideWall
Northeast wallRoom
Main Room, Mentzer HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Steve MillerDate
May 14, 2014Location
Cabinet
ToteBuilding
Storage (old gift shop upstairs)Category
PermanentLocation
Shelf
bottom left, bottom leftWall
far rightRoom
Main, Mentzer HallBuilding
Crater Rock MuseumCategory
PermanentLocation
Shelf
bottom - center, bottom - centerWall
far rightRoom
Main, Mentzer HallBuilding
Crater Rock MuseumCategory
Permanent
