Feldspar

Colors It Comes In -

White or gray: This is the most common color for feldspar. 
Pink or reddish: This is a common color for potassium feldspar also known as k-feldspar. Hematite inclusions can cause feldspar to be pinkish or reddish. 
Green to blue green: This is the color of amazonite, a variety of microcline. 
Yellowish: This is a color that plagioclase feldspar can range to. 
Reddish brown: This is a color that plagioclase feldspar can range to. 
Nearly black: This is a color that plagioclase feldspar can range to. 

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Fracture - Perfect

 

Shape - Blocky or Rectangular

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Luster - Glassy or Vitreous

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Texture -

Coarse: Feldspar can have a coarse texture if it cools slowly. 
Myrmekite: A wormy texture that is characteristic of K-feldspar. 
Microcline: A wavy black-gray-white twinning that is characteristic of K-feldspar. 
Perthite: A texture that occurs when high temperature K-feldspar cools slowly and absorbs little blabs or crystals of sodic feldspar albite. 
Zoning: A distinctive effect that can occur when crystals vary in composition from core to rim.

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Streak - White

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Locality - The top states for feldspar production in the United States are Virginia, South Dakota, California, Georgia, Idaho, Oklahoma, and North Carolina.

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Where It Can Be Found -

Igneous rocks: Feldspar is a common mineral in igneous rocks, which form when magma cools. 
Metamorphic rocks: Feldspar can also be found in veins of other rocks as a metamorphic mineral. 
Sedimentary rocks: Feldspar is sometimes incorporated into sedimentary rocks, but it's not as resistant as other minerals. 
Granite bodies: Feldspar is mined from large granite bodies, called plutons by geologists. 
Pegmatites: Feldspar is mined from pegmatites, which are formed when the last fluid stages of a crystallizing granite concentrate into small pockets. 
Sands: Feldspar is mined from sands that are mostly made up of feldspar. 

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Hardness On The Mohs Scale - 6 Out Of 10