It is important to distinguish between a mineral and a mineraloid. A mineral is an inorganic, naturally occurring substance that has a characteristic chemical composition, distinctive physical properties, and solid crystalline structure (an order 3 dimensional arrangement of atoms or molecules). If it does not have this solid crystalline structure, it is not a true mineral and is therefore a "mineraloid."
Opals are not truly minerals (because they don't have a crystalline structure), they are in a class called mineraloid. A mineraloid is an amophous, inorganics substance that lacks a crystalline structure, but are mineral in nature. You will find that in many older reference systems, they may well be classed as minerals.
A mineraloid is a mineral-like substance that does not demonstrate crystallinity. Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals.
No, it's a type of silica, and is classed as a mineraloid.
Opal is neither a sedimentary, igneous, nor metamorphic rock. It is actually a mineraloid composed of hydrated silica that is formed from silica-rich solutions at low temperature, often found in sedimentary rocks like sandstone or volcanic areas.
Opal, amber, and obsidian are three examples of mineraloids. Mineraloids are naturally occurring materials that lack a crystalline structure but have physical and chemical properties that resemble minerals.
nothing
Opal is an amorphous form of silica related to quartz, a mineraloid form, not a mineral. A mineraloid is a mineral-like substance that does not demonstrate crystallinity.Now you get it?
they are obsidian, opal, limonite
A mineraloid is a naturally occurring substance that lacks a crystalline structure, which distinguishes it from minerals that have a well-defined atomic structure. They may have a chemical composition similar to minerals but do not exhibit the same regularity in their internal arrangement of atoms. Amber and opal are examples of mineraloids.
There really isnt a crystal form. Therefore it is a mineraloid.
Neither. Opal is a mineraloid, as it does not have a sufficiently organized structure to be considered a mineral.
Opal is composed primarily of silica and water. It is a mineraloid, not a true mineral, because it lacks a crystalline structure.
Yes, tektite is considered a mineraloid. Tektites are natural glass formations that are formed from terrestrial debris ejected during meteorite impacts. They lack a crystalline structure, which is why they are classified as mineraloids rather than true minerals.
Opal is amorphous mineraloid, occurrence : Sedimentary and secondary from the alteration of high silica igneous extrusive rocks
Opal is often referred to as a mineraloid because it lacks a crystal structure, which is a defining characteristic of minerals. Instead, opal is made up of tiny silica spheres arranged in a more random, non-repeating pattern, giving it its unique play-of-color. This amorphous structure sets it apart from traditional minerals.
Opal is a hydrated amorphous form of silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals Opal is a hydrated amorphous form of silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as mineralssilica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals
It is to practice your scales and your arpeggios