Tag: famous stones

A Writers Guide to Cat’s Eye

Cat’s eye, or cymophane, is a translucent yellowish chrysoberyl that exhibits chatoyancy, a luminous streak of reflected light that’s perpendicular to the direction of the fibers. This is brought about by many parallel, featherlike fluid inclusions or needle-like inclusions of rutile. The most sought after is the milk and honey variety. It’s a honey-colored stone with a milky […]

A Writers Guide to Obsidian

Obsidian is a naturally occurring volcanic glass formed as an extrusive (lava that makes it to the surface or explodes violently into the atmosphere) igneous rock. It’s commonly deep black or blackish green, but there are many varieties. The Varieties: Apache Tears are small rounded obsidian nuggets embedded within a grayish-white perlite matrix. According to […]

A Writers Guide to Topaz

Topaz is a silicate mineral of aluminium and fluorine. Pure topaz is colorless and transparent, although it’s often tinted by impurities creating colors such as wine, yellow, pale gray, reddish-orange, blue, brown, white, pale green, blue, gold, pink, and reddish-yellow. Orange topaz is known as precious topaz. Imperial topaz is yellow, pink, or pink-orange. Brazilian Imperial […]

A Writer’s Guide to Diamonds

A diamond is a metastable allotrope of carbon. It has the highest hardness and thermal conductivity of any bulk material. Pure diamonds are colorless or transparent. Diamonds have an extremely rigid lattice (a repeating pattern of 8 atoms). Only a few types of impurities can contaminate it. These rare impurities or defects (about one per […]

A Writers Guide to Turquoise

Turquoise, an opaque mineral, is a hydrous phosphate of copper and aluminium. The color varies greatly from sky blue to green. This stone shows up in most of antiquity including ancient Egypt, Aztec culture, Persia, Mesopotamia, the Indus Valley, and ancient China. The word turquoise is derived from the old French word “Turquie” meaning “Turkish” […]

A Writers Guide to Onyx


Onyx is a form of chalcedony with banded strips of color that are typically parallel to each other. If the word chalcedony sounds familiar, it’s because bloodstone, carnelian, and jasper (previously featured here) are different forms of it. Though the color of bands in onyx comes in a huge range of colors including white, purple, and blue, the most […]

H.R. Sinclair © 2016
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