Now, some of you may be thinking: I have a mineral crystal that does not match the pictures in the mineral books. What you may have is a distorted crystal form where some faces may be extremely subordinate or even missing.
Generally there is no natural mineral crystallizing in this form and this type is classified to have in it a pyritohedron and the diploid.
PYRITOHEDRON:
This has twelve pentagonal faces in it and the mineral Pyrite is available in this form.
Mineral crystal - see quartz
Mohs scale - A scale of mineral hardness devised by Frederich Mohs in 1812, ranging from talc (1) to diamonds (10).
Moonstone - A translucent stone which is often bluish in colour; sometimes white ...
Mineral crystal: see Quartz.
Mint Condition: A piece of jewelry having no signs of wear whatsoever, including no discolored stones. A piece that is in Mint Condition is in virtually the same condition as it was when it left the manufacturer.
Mineral Crystal
see Quartz.
Ming's
Ming's of Honolulu (Hawaii) was a fine jewelry company that sold high-quality jewelry (both gold and silver), often using pearls, jade, coral, and ivory (often dyed).
mineral crystal
see QUARTZ
morganite
A variety of beryl that is pink. Named after J.P. Morgan. Found in California, Brazil, and Madagascar.
mineral crystal
Most gemstones are actually mineral crystals (except for non-mineral, organic gems like pearls, coral, and amber). Mineral crystals form through a naturally occurring combination of chemicals, heat, and/or pressure.
A mineral crystal contained in a diamond.
Inclusion
Imperfection internal to the Diamond.
The mineral crystallizes in the cubic crystal system. In the crystal structure, zinc and sulfur atoms are tetrahedrally coordinated. The structure is closely related to the structure of diamond. The hexagonal analog is known as the wurtzite structure.
Isotropic mineral crystals that belong to very symmetrical crystal systems (ie. cubic or hexagonal) are singly refractive, and these isotropic gems include: diamond, cubic zirconia, garnet and spinel.
Double Refraction in Anisotropic Gems ...
Gem
A mineral crystal or natural gemstone that has been cut and polished. In general, any attractive and relatively flawless mineral crystal can be cut into a gem.
In the case of mineral crystals, the dense areas (where atoms are closer together) absorb more Xrays than the less dense ones (where atoms are further apart), and a high contrast picture is produced.
There are two main uses for hydrochloric acid: removing carbonates like calcite that often are the last minerals to form in a pocket and therefore obscure other mineral crystals, ...
fission tracks Marks left in the latticework of a mineral crystal by subatomic particles released during the fission of a radioactive atom trapped inside the crystal.
Sometimes a diamond contains a mineral crystal that looks like a bubble or black spot and this feature is called crystal.
needle
A long and thin crystal.
pinpoint
A tiny crystal that appears like a dot.
cloud ...
Included Crystal: A mineral crystal contained in a diamond.
Inclusion: A clarity characteristic found within a diamond, also known as 'nature's fingerprints'. These can include a cloud, a fracture, cavities, graining etc.
The pineapple opal formed when a mineral crystal of a specie, now believed to have been ikalite rather than glauberite, was first replaced by calcite and then by opal.
Included Crystal: A mineral crystal contained in a diamond. Inclusion: Imperfection internal to the Diamond.
Inclusion: A clarity characteristic found within a diamond. Most inclusions were created when the gem first formed in the earth.
Included Crystals: mineral crystals, such as garnet or peridot, contained inside a diamond.
Indented Naturals: natural rough surfaces that penetrate the stone and may distort the girdle outline.
Intergrown crystals occur when two mineral crystals grow together and become one.
INVERALL SAPPHIRE
Inverall sapphires are a type of sapphire from Inverall, New South Wales.
TWIN CRYSTALS - Two or more mineral crystals that have grown together in a symmetrical nature, usually nonparallel. Sometimes called twinned crystals.
included crystal More than two dozen types of mineral crystals occur in diamond but diamond crystal itself is by far the most common.
inclusion Imperfections located inside the diamond.
Paragenesis..The sequence in time in which a mineral crystallizes with respect to the other minerals.
A diamond which contains a mineral crystal is known as included crystal.
Inclusion ...
For example corundum's usually come included with mineral crystal and silk like inclusions. While crystals degrade their eye appeal, silk like fibers of rutile appreciate their beauty.
Zoisite is a calcium aluminium hydroxy silicate belonging to the epidote group of minerals. Zoisite was first known as Saualpite after its type locality. The mineral crystalizes in othorhombic system, is usually gray although it can be brownish, ...
The special conditions that allow a mineral crystal to grow slowly and undisturbed, and thus remain transparent and evenly colored, are extremely rare in natural environments.
Thus it is a unique opportunity for the stone lovers to see this enormous crystal which is displayed at the Smithsonian's. However the Oppenheimer Diamond cannot be called a gem as it is uncut. Only those mineral crystals that have been polished and ...
' Of course, it helps that in May 1989 and April of this year, the mine’s chief of operations, John McLean, hit two major pockets filled with gem and mineral crystals. But in between it was slim pickings.
 See also: Mineral, Crystal, Crystals, Diamond, Color
  
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