Silver
There are many varieties of silver used in jewellery. Pure silver is rarely used because it is very soft and pliable and prone to tarnishing. Pure more...
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Gemstone Technical Data List (A to K)
This is a listing of gemstones with their specific gravity Mohs hardness refractive index and gemstone family classification in alphabetical order. more...
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Gemstone Technical Data List (L to Z)
Gemstone Technical Data List continued - Lapis to Zircon more...
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Crystals & Crystallography
The study of crystals is known as 'Crystallography' and is a very complex field. A crystal can be defined as, 'a homogeneous body (regular form) in more...
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Crystal Habits (Shapes)
The various shapes that crystals form in are referred to as 'habits'. Habit can also refer to the manner in which a number of crystals are grouped more...
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Transparency & Lustre
Transparency (or Diaphaneity) refers to the ability of a substance to transmit or absorb light. Lustre refers to the appearance of a mineral's more...
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Colour & Streak
Streak is the colour of a mineral in powdered form and is a useful means of mineral identification. It is sometimes tested by rubbing a mineral on a more...
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Hardness & Tenacity
The Mohs Scale represents the scratch resistance of 10 minerals from softest to hardest. It was created in 1812 by the German mineralogist Friedrich more...
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Cleavage & Fracture
Many minerals split of break readily along certain well-defined planes. This is referred to as 'Cleavage'.
Where a mineral breaks in an irregular more...
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Refractive Index & Specific Gravity
Refractive Index is the amount by which light is refracted by a stone. Light travels at different speeds through different media. When light passes more...
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Cleansing Crystals and Minerals
Crystals and minerals are highly efficient at storing and transmitting energy. A stone picks up and emits energy continually, so when you first more...
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