Clasts
Pebbles (in a conglomerate)
Geodes
Geodes
Quartz is a type of clastic rock. It is widely found in igneous, metamorphic, and sedimentary rocks, and is often colored by impurities.
None of them. Quartz is a mineral, not a rock type. Quartz could be found among any of the three classifications of rock--igneous, sedimentary, or metamorphic.
It is conceivable that a fossil could be found among sedimentary rock crystals, and some dead organisms have actually been replaced by minerals which are composed of crystals. Fossils in gems and crystals from metamorphic or igneous processes--no.
Quartz is the single most common rock forming mineral in the crust, and can be found in a huge number of rocks of all of the three types: sedimentary, metamorphic, and igneous.
Geodes
A geode,(I bielive)
They are called geodes.
They're geodes.
White quartz, often quite massive is found in schists. Clear quartz crystals I have found in sedimentary rocks.
Quartz is a mineral not a rock. Fossils can be found associated with quartz in sedimentary rock not inside the quartz.
Quartz is a type of clastic rock. It is widely found in igneous, metamorphic, and sedimentary rocks, and is often colored by impurities.
Quartz (SiO2) crystallizes from magma that is high in silica, thus most quartz is originally igneous. It then weathers out of igneous rocks as a clast and is deposited in what becomes a sedimentary rock. The original igneous rock or the quartz containing sedimentary rock can then become metamorphosed. Furthermore, quartz can also form out of solution by meteoric water or hydrothermal systems in which case it is a precipitate. It can be both crystalline or amorphous.
None of them. Quartz is a mineral, not a rock type. Quartz could be found among any of the three classifications of rock--igneous, sedimentary, or metamorphic.
It is conceivable that a fossil could be found among sedimentary rock crystals, and some dead organisms have actually been replaced by minerals which are composed of crystals. Fossils in gems and crystals from metamorphic or igneous processes--no.
geodes
Quartz is the single most common rock forming mineral in the crust, and can be found in a huge number of rocks of all of the three types: sedimentary, metamorphic, and igneous.