Mineraloid-a new word for you-right? Yes, it is to me too.
A mineraloid is a substance that is only mineral like though it does not possess the basic characteristic of all minerals which is crystalline
I think I should explain with a few examples.
Obsidian(see picture) which is a natural glass that falls in to the category of minerals but it is not a crystal.
Then there is the Jet which is a dense form of coal.
Do you know that Opal too is another mineraloid because of its non-crystal nature?
Pearls, considered by some to be a mineral because of the presence of calcium carbonate crystals within their structure, would be better considered a mineraloid because the crystals are bonded by an organic material and there is no definite proportion of the components.Hmm..- too chemical for us?
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