Gemstones questions

This is a list of recently added questions about gemstones.

Minerals quiz

What gemstone is this?

azurite

Malachite is a copper carbonate hydroxide mineral, with the formula Cu2CO3(OH)2. This opaque, green banded mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses, in fractures and spaces, deep underground.

Ninjai

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wikipedia → Malachite

Gemmology questions

What's the origin of the word "turquoise"?

Turku City in Finland

The name Turquoise was established in the seventeenth century and came from the name of Turkey (turquoise is French for "Turkish"), because the mineral was first brought to Europe from Turkey. Ancient Romans called this rock Kalalit.

GabrielBaran

Turkey questions

How can you cut a diamond?

Diamond is the hardest substance in the world. Hence it can be cut only by using a diamond.

Shruthi Srinivasan

Materials questions

What is the Greek name for amber?

Words like "electricity" come directly from the name of amber. Already the ancient Greeks noticed that this stone has a certain mysterious property: when rubbed with fur, it begins to attract particles of dust...

Marta_Smolarek

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Technology questions

What mineral is a heliodor gemstone a variety of?

Heliodor is a yellow transparent variety of beryllium (emerald and aquamarine are also varieties of beryllium). The name derives from the Greek word helios = sun (sun-god) and doron = gift ("gift of the Sun").

Paweł Kołodziejczyk

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wikipedia → Beryl#Golden beryl and heliodor

Minerals questions

What colour is sapphire colour a shade of?

The name of the colour comes from sapphire, a blue variety of the corundum.

Paweł Kołodziejczyk

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wikipedia → Sapphire

Colors questions

What colour is emerald colour a shade of?

The name derives from the Greek smaragdos (as well as Lat. smaragdus - green). It refers to the characteristic colour of emerald stones.

Paweł Kołodziejczyk

Minerals questions

Where are emeralds found the most?

Colombia is by far the world's largest producer of emeralds, constituting 50–95% of the world production. The Colombian emeralds are also the purest. The emerald trade is at the center of funding of ongoing civil conflict in Colombia, second to drug trade.

globalquiz.org

Natural resources questions

Where do you have the best chance to find a natural diamond?

It is sometimes mistakenly believed that diamonds are made from coals. High pressure and heat is required for the formation of diamonds from carbons, but these carbons are not the ones that form coal. Diamonds are formed deep under the surface and are brought up during outbreaks of volcanoes.

Monica Stiller

Coal questions

What was used as a unit of mass in the classical times?

Carat, a unit of mass equal to 200 mg, is derived from a carob seed (Greek kerátion). People commonly believed that the seeds have unusually low variability in mass. Modern research denied this claim.

globalquiz.org

Units questions

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