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Mineraloid - Wikipedia

en.wikipedia.org/wiki/Mineraloid

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

www.reference.com/science/coal-considered-mineral-ef84b0efe2ef5c29

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

www.quora.com/Why-is-coal-not-considered-a-mineral

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. Stable at room ...

Coal - U. of Oregon

jersey.uoregon.edu/~mstrick/AskGeoMan/000086_AskGeo.html

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?

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

www.madsci.org/posts/archives/2003-12/1070390305.Es.r.html

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 ...

What Is A Mineral? - Rocks and Minerals

www.rocksandminerals4u.com/what_is_a_mineral.html

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 ...

sedimentology - Why is coal classified as a sedimentary rock ...

earthscience.stackexchange.com/questions/6708/why-is-coal-classified-as-a-sedimentary-rock

Oct 12, 2015 ... Coal, bitumen, and shale are all made of organic matter. ... All coal will contain a small fraction of mineral matter and most if not all shale will contain a fraction of organic matter. .... Is referring to people as "it" considered rude?

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

geology.com/articles/water-mineral/

A natural snowflake would be considered to be a mineral because it forms naturally ... Water is not a mineral; however, it freezes into ice, which is a mineral. ... Biggest Misconception: Lots of people think that diamonds form from coal. Not True!

Is Natural Gas a mineral? | Billman Geologic

billmangeologic.com/2013/03/is-natural-gas-a-mineral/

Mar 2, 2013 ... As a geologist … a scientist (and certainly not a lawyer), we know the answer is, “ No”. ... from the Marcellus Shale and the shale itself are legally considered a mineral. ... Coal can be an economically mineable “mineral”.

What Are Minerals? Four Things That Define Them - Geology

geology.about.com/od/mineralsresources/a/whatsamineral.htm

Traditionally and officially, native mercury is considered a mineral, even though the metal ... The substances that make up coal, for instance, are different kinds of  ...

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Why is coal not a mineral? | Reference.com

www.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

www.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, ...

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

www.answers.com

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