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from Etsy

Ammonite Fossil // Unusual Fossil // Iridescent Ammonite // Large Ammonite Fossil // Madagascar Ammonite // Stone Fossil // AMT6

Ammonite Fossil // Unusual Fossil // Iridescent by CastoGemstones, $16.00

A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. The stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern portion of Michigan's lower peninsula. In those same areas of Michigan, complete fossilized coral colony heads can be found in the source rocks for the Petoskey stones.

A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. The stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern portion of Michigan's lower peninsula. In those same areas of Michigan, complete fossilized coral colony heads can be found in the source rocks for the Petoskey stones.

from Sage Lifestyle

Enchanted by Amber

The #Amber stone, which is actually not a stone but fossilized tree resin, which has been appreciated for its color and natural beauty since Neolithic times is said to have powerful healing strength given to the person who wears it. The lovely warm stone helps balance the emotions, clears the mind and eases stress. #thesagelifestyle

A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. The stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern portion of Michigan's lower peninsula. In those same areas of Michigan, complete fossilized coral colony heads can be found in the source rocks for the Petoskey stones.

from eBay

12.7lbs Unusual Natural Structure Stone From Guangxi China

Jadeite may sound like the various semi-precious stones known informally as "jade," but this incredibly rare gem is many times more valuable. Prized most when it is colored a deep, translucent green, Jadeite is mainly found in limited quantities in Myanmar. In 1997, Christie's auction house sold a Jadeite necklace for nearly $10 million. The highest quality "Imperial" Jadeite can sell for millions of dollars per carat when cut and polished. Sadly, many traders have passed off color-treated…

The Fairburn Agate is the state stone in South Dakota. This is an unusual agate, in that it formed in sedimentary rock, rather than igneous rocks in which most other agates are formed.