Chinese Name：達碧茲紫晶 / 達碧茲紫晶 / 查皮丘紫晶
English Name：Trapiche Amethyst
Chemical Composition：SiO2
Crystal System：Trigonal
Hardness：7.0
SG：2.65
RI：1.54 - 1.55 (Double Refraction +0.009)
Related Chakra：Third-eye, crown
Birthstone：Feburary
Astrological Sign: Aries, Virgo, Scorpio, Sagittarius, Aquarius, Pisces
Locality：Brazil, Russia, Canada, Sri Lanka, India, Uruguay, Madagascar, United States, Germany, Australia, Namibia, Zambia
Colour：light purple to dark purple
Inclusion：Banded structures known as "tiger stripes", sometimes rutile is there.
Remarks：The name "Amethyst" means "not drunden" (Greek), as amethyst was worn as an amulet against drunkenness.

Through the cross section, can see the 6-rays radiative pattern. This type of Quartz was first found in the Dorogawa-Goyomatsu mine, Honshu Island, Japan, Follow by other countries like Burma, Colombia, Inner Mongolia of China. It's a rare type of gems.

The name "Trapiche" comes from tra.pi.che (de azúcar), meaning "of sugar." The term trapiche was fist used for "trapiche emeralds", are named for the grinding wheel used to process sugarcane in the region of Colombia, South America where they are most often found.

The designation "trapiche" refers to a growth phenomenon that has been defined by the skeletal and sectoral growth of a crystal, yielding a fixed star when observed in sections perpendicular to the c-and optic axis of the crystals (Schmetzer et al., 2011).

Gem types which are found to have the trapiche pattern included: Emerald, Chiastolite, Corundum(both ruby and sapphire), Tourmaline, Garnet, Spinel, Aquamarine and Quartz