Dugway Geode

Name:

Dugway Geode

Other Name:

Thunderegg

Pronunciation:

Dug-way

Type:

Volcanic Rhyolite

Classification:

Rhyolitic thunderegg, Volcanic

Luster:

exterior is dull, interior glassy

Chemical Formulation:

silica dioxide (SiO2), and Potassium Oxide (K2O)

Fluorescent:

Yes, Mostly

Mohs Hardness:

6.5 - 7

Color:

dull brownish-gray exterior, interior shades of white, gray, light blue, purple or pink

Fracture/Cleavage:

conchoidal fracture

Uses:

Decorative display, jewelry making

Key Features:

cavities lined with white, clear, or amethyst quartz, alongside banded agate, typically ranging from 2 to 4 inches in size.

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