Based on their method of formation.
Graphite is a mineral, not a rock that is classified as metamorphic, igneous or sedimentary.
Talc is a mineral and is not classified as metamorphic, sedimentary, or igneous as are rocks.
Calcite is a mineral and not classified as metamorphic, sedimentary, or igneous, although it is usually associated with sedimentary rock formations.
Amethyst is actually a variety of quartz, and as a mineral, is not classified as igneous, metamorphic, or sedimentary as are rocks.
Azurite is a mineral and is not classified as a metamorphic, sedimentary or igneous rock.
Graphite is a mineral, not a rock that is classified as metamorphic, igneous or sedimentary.
Talc is a mineral and is not classified as metamorphic, sedimentary, or igneous as are rocks.
Calcite is a mineral and not classified as metamorphic, sedimentary, or igneous, although it is usually associated with sedimentary rock formations.
Amethyst is actually a variety of quartz, and as a mineral, is not classified as igneous, metamorphic, or sedimentary as are rocks.
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Azurite is a mineral and is not classified as a metamorphic, sedimentary or igneous rock.
its igneous and sedimentary and metamorphic
== == Mica is actually a group of silicate minerals, not classified as sedimentary, metamorphic, or igneous, although mica can appear in rocks of all three classifications. == ==
They are classified by origin, method of formation, mineral composition, and texture.
Limonite is a recognized mineral by the IMA, although its chemical structure will vary. As a mineral, it is not classified as igneous, sedimentary, or metamorphic in the manner of rock identification
Yes. That is the basis of the classifications. === ===
Igneous, metamorphic and sedimentary are the three rock types.