Black Tourmaline Shorl is exclusively black and is never transparent or translucent. It is the most common form of Tourmaline.  It may form in tiny dense needles within a Quartz crystal where it is then known as Tourmalinated Quartz.
 
Quartz is found worldwide and forms at any temperature in igneous, metamorphic, and sedimentary rocks. 
 
Sphalerite is a zinc sulfide mineral with a chemical composition of (Zn,Fe)S found in metamorphic, igneous, and sedimentary rocks in many parts of the world. 
 
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* Sizes, shapes and colors my vary due to being a natural stone, being hand-carved and/or difference in computer monitors