The Basics: What you need to know (Mineral, Mineraloid and Rocks)The difference between a Mineral, Mineraloid and a Stone/Rock. A mineral is defined as being a natural occurring geological solid substance that has a defined chemical atomic structure, chemical composition and has specific physical properties. It must also have a crystalline structure. Some examples of a mineral: Quartz Hematite Fluorite A mineraloid is similar to a mineral but does not have a crystalline structure, may not have a very defined chemical structure and may not be solid. Some examples of a mineraloid: Amber Obsidian Opal A rock or stone however is different. A stone is a natural combination that can consist of one or several different types of minerals and mineraloids. They can be classified into three categories; igneous (from Magma/Lava), sedimentary (deposition of different materials over time) and metamorphic (rock altered due to heat/pressure). Some examples of a stone:
Ruby Zoisite
Bloodstone
Moss Agate
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