1. PYRITE- Also known as fools gold, it is used as an ornamental material.
2. OLIVINE-The gem quality variety is known as peridot.
3. GARNET- A common mineral, but rarely having gem quality or color.
4. CORUNDUM-The gem quality grade of corundum is sapphire.
5. AMAZONITE- A rare green form of microcline feldspar.
6. SPODUMENE- A lithium aluminum silicate. Kunzite is the gem variety.
7. TURQUOISE-A copper mineral that has been used as a gem by America Indians for centuries.
8. AGATE-A banded form of quartz used for carvings and ornamental stones.
9. SNOWFLAKE OBSIDIAN-A form of volcanic glass, the snowflakes are inclusions of the mineral cristobalite.
10. TOURMALINE-Black tourmaline is commonly found in pegmatites. Gem tourmaline is usually green, pink or blue.
11. JADEITE - The gem quality is used in sculptures and costume jewelry.
12. AMETHYST-A purple variety of quartz used in jewelry.
13. RHODONITE-A magnesium silicate mineral used in jewelry and carvings.
14. QUARTZ CRYSTAL- Collectors of quartz crystals first believed that quartz crystals, or rock crystals were petrified ice.
15. BERYL-A beryllium aluminum silicate, aquamarine and emerald are gem varieties of this mineral.
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Rare minerals are called rare earth minerals. Their major metal constituents contain one or more rare earth elements. Some common hydrothermal rare minerals include zircon, gadolinite, brockite, and titanite.
A gem is considered any attractive mineral or rock which when cut and polished, may be used for ornamentation. A gem can be either a mineral or a rock, but most gems are minerals. A rock is an aggregate of many minerals, with no specific structure, while a mineral has a much more ordered atomic structure, with specific physical and chemical properties. A gem is not necessarily a crystal; lapis lazuli is not a mineral or a crystal, yet can still be considered a gem due to its desirable color and traits when polished.
Minerals that crystallize directly from seawater are examples of hydrogenous sediment.
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non-silicate.
Opals, rubies, emeralds, diamonds, and sapphires are all minerals. In fact, all gems are minerals with the exception of pearls, which have a biological origin.
no
Opal and amber are not minerals.
Opal and amber are not minerals.
Stones that are rare, and look beautiful are considered Gems.
a gemstone is precious a mineral is a rck
Peridot is gem-quality olivine.
Rare minerals are called rare earth minerals. Their major metal constituents contain one or more rare earth elements. Some common hydrothermal rare minerals include zircon, gadolinite, brockite, and titanite.
All gems are minerals, but not all minerals are gems. In order for the mineral to be classified as a gem, the mineral must have very specific qualities. Minerals are judged on the following:beautydurabilityrarityportabilityand among other things..Submitted answer does not answer the question nor is it correct. All Gems are not minerals. A Gem is a piece of rock or mineral, which, in cut and polished form, is used to make jewelry or other adornments.
Because of their shiny (gem-like) images
a moonstone gem is a stone that looks white like the moon
Sapphire is a gem-quality variant of the mineral corundum.