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Problems with dating metamorphic rocks

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Igneous rocks formed on the surface cool down in just a matter of a few hours.The crystals in these rocks can be microscopically small.Astronomy Worksheets Biology Worksheets Coloring Worksheets Dinosaur Worksheets Geology Worksheets Geography Worksheets History Worksheets Holiday Worksheets Math Worksheets Language Arts Worksheets All Educational Worksheets Astronomy Music Biology Music Concepts Music Chemistry Music Foreign Language Music Geology Music Geography Music History Music Language Arts Music Life Skills Music Math Music Physics Music All Educational Music Igneous rocks that form deep within the Earth’s crust where temperatures are very high might take thousands of years to cool down.This causes the crystals to be much larger, such as in the case of granite.

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Rocks, on the other hand, are composed of a variety of different minerals and are not consistent throughout their structure.

The top left cabochon has large patches of calcite that are intergrown with blue lazurite to yield a faded denim color. For most people, it would be the least desirable stone in the photo; however, some people will enjoy it.

Desirability in lapis varies from stone to stone and from person to person.

Lapis Lazuli Gemstones: As a general rule, solid blue lapis or solid blue with a few grains of gold pyrite are the most desirable colors.

In the photo above the bottom two cabochons approach that ideal.