Geode

Colors It Comes In - white, gray, blue, yellow, orange, purple, black

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Fracture Pattern - conchoidal

 

Shape - In the Greek language, geode means “shape of the earth”, and geodes are round like earth or oblong like an egg. They can be a couple inches or several feet in size.

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Luster -

Crystals: Geodes with crystals can have a glassy to vitreous luster.
Cryptocrystalline forms: Geodes with cryptocrystalline forms can have a waxy to dull luster, but can also be vitreous.

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Texture - Hollow geodes have an outer shell or rind of quartz, most often the variety chalcedony. The chalcedony often has a bumpy or lumpy appearance from the outside. But the bumpy appearance is no assurance that the inside of the spherical rock will be hollow.

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Where It Can Be Found -

Brazil, Uruguay, and Namibia
Large amethyst-lined geodes are found in the basalts of the Paraná and Etendeka traps in these countries. 
United States
Geodes are common in Indiana, Iowa, Missouri, western Illinois, Kentucky, and Utah. 
England
Geodes are abundant in the Mendip Hills in Somerset, England, where they are known locally as "potato stones". 
Morocco
Some of the most valuable geodes come from Morocco, and can sell for hundreds or even thousands of dollars. 
Dugway Geode Beds
Geodes can be found by digging in the soft gray unconsolidated materials in this area.

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Iowa's renowned Keokuk geodes can be found in specific stream drainages and excavations in parts of southeastern Iowa (especially in Lee, Henry, and Van Buren counties), including the area near Geode State Park.

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Mr. Alexander is proudly born, raised, and lives in Iowa.

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Hardness On The Mohs Scale - 6.5 To 7.5 Out Of 10