Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'mineraloid'?

A. The majority of minerals are non-metallic, i.e., they are not elemental minerals which are of metal elements or alloys of metals. [Wikipedia]
B. A the concept is a mineral-like substance that does not demonstrate crystallinity. Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals. For example, obsidian is an amorphous glass and not a crystal. [Wikipedia]
C. the concept is a ferrimagnetic mineral with chemical formula Fe3O4, one of several iron oxides and a member of the spinel group. [Wikipedia]
D. the concept, also spelled as hæmatite, is the mineral form of Iron(III) oxide (Fe2O3), one of several iron oxides. the concept crystallizes in the rhombohedral system, and it has the same crystal structure as ilmenite and as corundum. the concept is a mineral, colored black to steel or silver-gray, brown to reddish brown, or red. It is mined as the main ore of iron [Wikipedia]

Answer: A the concept is a mineral-like substance that does not demonstrate crystallinity. Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals. For example, obsidian is an amorphous glass and not a crystal. [Wikipedia]