Explanation

The oxide minerals with simple shelf structure are commonly Doffen twin crystals composed of two left or two right forms; Brazilian twin consisting of a left shape and a right shape; There are also Japanese twin. The aggregates are granular or cluster shaped. Kidney shaped, bell shaped cryptocrystalline quartze is called chalcedony (gray blue to blue-green chalcedony is called blue chalcedony, and green chalcedony is called green chalcedony); The nodular chalcedony is called flint; agate is composed of polychrome chalcedony and has concentric banded structure. The dense block of cryptocrystalline quartze with brick red, yellow brown and green is called jasper. Ar quartze is often colorless and milky white, and it often has multiple colors due to different mixed figures or mechanical blends. Colorless and transparent ones are called crystal; Milky white is called milky quartz (containing a large amount of gas-liquid inclusions); Purple is called amethyste (containing manganese and Fe3+); Light rose color is called rose quartz (containing manganese and titanium); Yellow and lemon are called yellow crystal or dtrhle (containing Fe2+and water); Smoke color is called smoke crystal; Brown ones are called tea crystals: black transparent ones are called ink crystals; Those with scaly hematite or mica in maroon or yellowish color are called aventurine; Due to the replacement of asbestos, it has a variety of colors, with silk luster, and is called cats eye [tiger's eye (yellow), eagle's eye (blue gray)]. glass luster, fracture grease luster, no cleavage, shell fracture, Mohs hardness 7, density 2.65g/cm3. With piezoelectricity, it is insoluble in any acid other than hydrofluoric acid. R-SiO2 is one of the most widely distributed minerals -- it is the main rock forming mineral of magmatic rocks, sedimentary rock and metamorphic rock. It is generally the latest formed in plutonic rock magma; phenocryst often appear in acidic volcanic rock; In pegmatite and potassium feldspar regularly connect to form graphic texture; The hydrothermal veins are massive or long columnar, which are the main gangue minerals. Because of their stable properties, they are often concentrated into placers. Colorless, transparent, twinned, impurity free, and fissure free crystal can be used as piezoelectric quartze, and can also be used in radio industry as oscillating elements. They can also be used in optical instruments. quartze can be used as raw materials for glass and ceramics. agate can be used as grinding equipment, bearings, and gems materials

Classification