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Rocks and Minerals
By Trevor
Facts about rocks and Minerals
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Diamond is the hardest natural substance found on Earth.
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Quartz is one of the most common minerals on Earth.
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Marble forms from metamorphosed carbonate rock, most usually
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Limestone.
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Basalt is the most common rock on Earth
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Feldspars make up more than 50% of the Earth's crust
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Rubies are one of the most popular gemstones today
Earth is approximately 4.8 billion years old.
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The biggest pure-gold nugget was found in Australia in 1869 and
weighed 156 pounds.
What Are Minerals?
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Minerals are made from 92 elements that join
together in many different ways. Some minerals are
made of only one element such as silver. Most are
combined of two or more elements such as granite
which is made of quartz, feldspar, mica. Scientists have
identified over 3,000 minerals. The particles of
minerals are arranged in a repeating pattern called a
crystal.
Recognizing a mineral is not an easy job. There are
several different properties of minerals and tests that
are used to identify them. The properties are: luster,
hardness, color, streak, cleavage, crystal shape, and
magnetism. Challenge yourself to identify minerals.
Pictures of different rocks and minerals
More facts about rocks and minerals

Platinum is so rare that there is two million pounds of contain
and only one pound of metal.
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Meteorites, rocks from space help scientists learn about the solar
system and are very valuable, too.

The Taj Mahal built between 1632 and 1654 in India is made
entirely out of marble.
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Thanks for watching
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