Item Number
681
Type
image
Description
Thunder Egg Agate
Size
18 x 17 x 3
Status
in inventory
Display/Storage
Storage
Building
Zuhl Library
Gallery/Room\Floor
Cage
Notes
A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. They usually contain centres of chalcedony which may have been fractured followed by deposition of agate, jasper or opal. A thunderegg may be referred to as a geode if it has a hollow in it, but not all geodes are thundereggs because there are many different ways for a hollow to form. Similarly, a thunderegg is just one of the forms that agate can assume.
Preview
Description
A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. They usually contain centres of chalcedony which may have been fractured followed by deposition of agate, jasper or opal. A thunderegg may be referred to as a geode if it has a hollow in it, but not all geodes are thundereggs because there are many different ways for a hollow to form. Similarly, a thunderegg is just one of the forms that agate can assume. 3 x 2.75
Keywords
Thunder Egg Agate A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. They usually contain centres of chalcedony which may have been fractured followed by deposition of agate, jasper or opal. A thunderegg may be referred to as a geode if it has a hollow in it, but not all geodes are thundereggs because there are many different ways for a hollow to form. Similarly, a thunderegg is just one of the forms that agate can assume. Mineral
Keywords
Thunder Egg Agate A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. They usually contain centres of chalcedony which may have been fractured followed by deposition of agate, jasper or opal. A thunderegg may be referred to as a geode if it has a hollow in it, but not all geodes are thundereggs because there are many different ways for a hollow to form. Similarly, a thunderegg is just one of the forms that agate can assume. Mineral