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A mineraloid is a mineral-like substance that does not demonstrate crystallinity. Mineraloids ... Pearl, considered by some to be a mineral because of the presence of calcium carbonate crystals with...

Why is coal not considered a mineral? | Reference.com


Coal is not considered a mineral because it does not have a solid, uniform crystal structure, meaning it doesn't fit the primary definition of a mineral. Coal is ...

Why is coal not considered a mineral? - Quora


If something is to be classified as a mineral, it have to fulfill the following criteria; 1 . Naturally occuring (i.e. it has to form by natural processes) 2....

Why is coal not considered to be a mineral - Answers.com


Coal is carbon based organic material. Mineral definition requires that material be inorganic with a defined chemical composition and repeating crystalline ...

Re: If coal is not a mineral because it is organic, why is diamond a ...


Dec 1, 2003 ... Re: If coal is not a mineral because it is organic, why is diamond a ... In earth materials, it is the "mineraloids," things that look and behave like ...

Kentucky's State Mineral is coal - University of Kentucky


Kentucky's State Mineral is coal, Educational Resources for K-16, Kentucky Geological Survey. ... One problem is that scientifically coal is a rock, not a mineral. ... But legally, coal is considered a mineral resource and is taxed as a mineral.

Is Water a Mineral? -- Is Ice a Mineral? - Geology.com


A natural snowflake would be considered to be a mineral because it forms naturally in Earth's atmosphere. However an ice cube made in a refrigerator would not ...

What Are Minerals? Four Things That Define Them - Geology


Minerals meet four criteria, more or less strict. ... Traditionally and officially, native mercury is considered a mineral, even though the metal is liquid at room temperature. ... The substances that make up coal, for instance, are different kinds of ...

What Is A Mineral? - Rocks and Minerals


To be considered a mineral it must have been formed by natural geologic processes. ... This classifies it as an organic compound and so is not a mineral. Coal on the other hand also comes from plants (organic) and is generally considered a ...

What is A Rock? - Rocks and Minerals


Most rocks are a solid mixture of several minerals like granite. ... Coal is considered a rock but it is not made of minerals it comes from organic matter plants.

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Why is coal not a mineral? | Reference.com


Coal is not a mineral because it is organic, and minerals are inorganic. Minerals have a repeating crystalline structure and a homogeneous chemical profile.

Coal - Mine Engineer.Com


A mineral is a naturally occuring, homogeneous, solid with a crystalline atomic ... however both diamonds and graphite are considered minerals, and both are ... Coal is not a mineral, because it can not be expressed as a chemical formula, ...

Coal - U. of Oregon


What's the deal with coal? ... an organic sedimentary rock, but rocks are combinations of minerals, and minerals are inorganic. Coal is made of decomposed plants, which are organic. ... And anyway, if coal is not a rock, what should we call it?