Opal is amorphous mineraloid, occurrence : Sedimentary and secondary from the alteration of high silica igneous extrusive rocks
ANSWER: rock cycle
Opal is not considered a rock but actually a mineraloid gel. It is deposited at relatively low temperatures. One of the characteristics if igneous rocks, sometimes called fire rocks, is that they are formed at high temperatures. Whether an igneous rock forms below ground, or on or near the surface, it's all about heat forming the rock. Opal cannot take its form under that kind of heat.
An example that is not part of the rock cycle would be a volcanic eruption, where molten rock (magma) is expelled from Earth's interior onto its surface. This event is a singular occurrence and does not illustrate the continuous processes of rock formation, transformation, and recycling that make up the rock cycle.
The types of Opal that i am familiar with are White Opal, Fire Opal, Boulder Opal, Black Opal, Crystal Opal, Light Opal, Doublet Opal, Triplet Opal, Common Opal, Synthetic Opal, and Immitation Opal.
The rock cycle is how one type of rock can be changed into another type of rock.
yes
Its a rock. Just a shiny one.
Neither. Opal is a mineraloid, as it does not have a sufficiently organized structure to be considered a mineral.
No, it's actually a form of silica.
igneous
opal
No, the rock cycle does not have to start from the sedimentary rock
The rock cycle and water cycle both are natural.
It is called the Rock Cycle.
there is no beginning or end of the rock cycle
The Rock Cycle contributes to the formation of rocks : ~ )
ANSWER: rock cycle