White Howlite 14x18mm Dove - 15-16 Inch Stone Type_Fossil When the abalone shell is

When the abalone shell is struck

Calcite is the principal constituent of limestone and marble

and creams

The most precious Fire Opal has flashes of iridescence and is known as Precious Fire Opal or “Firmament Stone

It is an opaque stone

White Howlite 14x18mm Dove - 15-16 Inch Stone Type_Fossil When the abalone shell isWhite Howlite is named for Canadian mineralogist Henry How, who first discovered the stone in Southern California in 1868. It is typically white or light gray with gray, black or brown veins running through it in web to like patterns. Because of its softness, Howlite can be easily dyed and is often treated to be blue for use as a substitute for turquoise.