It often forms as prismatic crystals with a square or rectangular cross-section

and zinc ores

Dimensions:  125x71x3 mm / 4

Color: Chrome Green

Color:   Pale Blue

Tourmalinated Quartz | Square Cut | 17mm 19.7ct | Brazil Orthoclase It often forms as prismaticProduct Type: Tourmalinated Quartz Approx Weight (per piece): 19. 7ct Size: 17mm Shape: Square Cut Color: Colorless Clarity: Tourmalinated Clear Origin: Brazil Treatment: Natural No known treatment The appearance of Tourmalinated Quartz is characterized by clear or milky quartz with dark, thread like, or needle shaped inclusions of black tourmaline running through the stone. These inclusions can vary in density, giving each piece a distinct and unique