What is cryptocrystalline quartz?


Although many varieties have historically originated fr […]

Although many varieties have historically originated from the color of the mineral, the current scientific naming scheme refers primarily to the microstructure of the mineral. Color is a secondary identifier for cryptocrystalline minerals, although it is the primary identifier for macrocrystalline varieties. E.g:

agate. Multicolor, curved or concentric banded chalcedony (see Agate). Translucent to translucent.

Chalcedony. Fibrous, translucent cryptocrystalline quartz in many forms. The term is commonly used for white, turbid, or light-colored substances that grow with muscovite. Chalcedony is a cryptocrystalline form of silicon dioxide, consisting of quartz and its monoclinic polycrystalline molybdenum. Other opaque gemstones are quartz, or mixed rocks, including quartz, which usually include a pattern of contrasting bands or colors, agate, agate or chalcedony, onyx, heliotrope, and jasper.

jasper. Opaque cryptocrystalline quartz, usually red to brown, but often used in other colors. opaque
Otherwise, a more specific name will be used:

Ruby. Red orange chalcedony. translucent.

y agate. Multi-colored, with chalcedony or stone (see onyx). Translucent to opaque.
Tiger Eye. Fibrous gold, reddish-brown or blue chalcedony, floating.