macrocrystalline Having crystals large enough to be seen with an unaided eye. mafic Describing dark colored rocks or minerals that are composed particularly of magnesium and iron.
macrocrystalline (n) crystals which are visible by sight.
microcystalline (n) tiny crystals which are discernable with the use of optical microscopes. Cf Cryptocrystalline.
The macrocrystalline quartz (large crystal) group includes many popular gemstones such as amethyst, ametrine, citrine, green amethyst (prasiolite), rose quartz, rutilated quartz, smoky quartz and tiger’s eye.
A form of Macrocrystalline quartz. It can be found in Brazil, India, China and Japan. Most Aventurine is reddish brown to yellow in color with shimmering metallic particles called mica throughout the stone.
Ametrine is macrocrystalline variety of quartz. The chemical composition is Silicon Dioxide having the formula SiO2.
Hardness
7 ( Mohs) .
Is Sub-categorized into two different areas: Macrocrystalline quartz and Cryptocrystalline quartz.
The Macrocrystalline quartz can be seen by the naked eye.
The two varieties of quartz are macrocrystalline (crystals recognizable with the naked eye) and microcrystalline or cryptocrystalline (crystals too small to see without high magnification).
The most important distinction between types of quartz is that of macrocrystalline (individual crystals visible to the unaided eye) and the microcrystalline or cryptocrystalline varieties ...
Quartz includes a large group of minerals based on silicon dioxide. Rose quartz is a macrocrystalline form. It is a milky pink in color and it is believed that the pink color is due to a small amounts of titanium.
The presence of fuchsite inclusions, a chrome-bearing variety of muscovite mica, gives aventurine its characteristic silvery greenish-blue sheen. High quantities of fuchsite can cause aventurine to be totally opaque. This macrocrystalline quartz has ...
 See also: Crystalline, Jewelry, Quartz, Stone, Color
  
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