Igneous Intrusions
Pegmatites.
decreased microbial decomposition, often anoxic.
Geodes are rocks that are lined or filled with crystals. Pegmatites are rock formations that often exhibit extremely large crystals. Just a note--all rocks are composed of mineral crystals, with few exceptions. The crystals in some, however are just too small to see.
the word crystalline is often used to describe the internal structure of crystals
Cold fronts and warm fronts in the middle latitudes are often associated with low pressure. It is also associated with a middle latitude cyclone.
Pegmatites.
Ore deposits
Azurite is a deep blue mineral. It is often associated with copper deposits.
Yes. If the crystals are big enough. Often you can see crystals with no magnification at all!
Payroll deposits
bottom of the ocean
No. Calcium deposits are not alive/ However, deposits of calcium carbonate are often made of the shells of once living, but long ded organisms.
decreased microbial decomposition, often anoxic.
No, Emerald is a variety of the mineral beryl (Be3Al2(SiO3)6,) colored green by trace amounts of chromium and sometimes vanadium and not an igneous rock. However beryl crystals form in association with Granite intrusions (which are Igneous rocks) and are often associated with tin and tungsten ore bodies in what are called pegmatities. They are also to be found in mica schists which are metamorphic rocks and also uniquely, the emerald deposits in Colombia Colombia are in limestone, a sedimentary rock.
Cirrus clouds
Yes, Most Often They Are
They often do. Really.