Agate Slices from Brazil

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How’s Agate Formed?


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Agate Info:
Agates are semi-precious gemstones that are a variegated form of chalcedony (pronounced kal-sed’-nee), which is silicon dioxide in the form of microscopic fibrous quartz crystals. Agates naturally develop when an empty pocket inside a host rock fills in molecule-by-molecule, layer-by-layer as these microcrystals self organize to form concentric bands or other patterns. The colors and arrangement of the microcrystals are influenced by changes in pressure, temperature, and mineral content that occur during the formation process. Unlike other gemstones, each agate is unique. Even slabs cut from the same specimen will vary in color and design.

Agates develop as secondary deposits in hollow cavities, called vesicles. Although they can form in all types of host rock, most of the world’s agates developed in ancient volcanic lava. When the continents were first forming, layers of molten lava pushed toward the earth’s surface through rift zone cracks, volcanoes, and other geologic events. Within the lava, there were pockets of trapped gases. Later, these gases escaped through cracks that formed as the igneous rock cooled and hardened, leaving hollow cavities. Other cracks and seams also formed when adjoining sections of lava cooled at different rates.


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How Orthoceras Fossils are Made

How are Orthoceras Fossils Formed?


Orthoceras (straight horn )is an extinct nautiloid cephalopod.

The Orthoceras ranged in size from a few inches in length to over six feet. They could swim as well as crawl on the ocean floor. By filling the chambers in their shells with air they could float through the seas propelling themselves by squirting jets of water. As they died their shells accumulated upon the ocean floor, then covered by sediments they transformed into stone over the ages.

(Artist Rendition)orthoceras_bw

You can find Orthoceras Specimens from our online rock shop
You can also visit or Olde Towne location in Bellevue, NE

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How is Amethyst Formed | Created?

Amethyst Formationamethystchurch1

A question we get asked a lot: How is Amethyst is formed?

The simple answer: Most of the Amethyst found today (from Brazil and Uruguay) was formed ~130 to 150 million years ago from ancient lava fields.

As lava from volcano’s forms and cools, several pockets (cavities) are created which traps gasses and water inside the cavities. Crystals are formed over time within these cavities.  If Iron and\or Manganese is present during the crystal formation, then that’s what turns the clear quartz crystals purple – Thus creating Amethyst crystals.

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See our current selection via our store

#minerals #rockshop #vanadinite #homedecor #interiordesign #chakra #metaphysical

#minerals #rockshop #vanadinite #homedecor #interiordesign #chakra #metaphysical

RockOn Omaha 101

tn_red_agateWelcome to RockOn Omaha’s Blog

This site was developed to explore and explain:

-How Rocks and Minerals are Formed

-How Rocks and Minerals get their Color

-Metaphysical Information related to Rocks and Minerals

Basically, a learning site that hopes to expand the knowledge and information related to common minerals