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Alkali feldspar has the general formula (K,Na)AlSi3O8, but varies in crystal structure depending on the temperature it formed at. The formula actually is a blend ranging from all sodium (albite) to all potassium (microcline), but albite is also one endpoint in the plagioclase series so we classify albite there.
This mineral is often called potassium feldspar or K-feldspar, because by definition potassium always exceeds sodium in its formula. It comes in three different crystal structures that depend on the temperature it formed at.
Microcline is the stable form below about 400° C. Orthoclase is stable above 500° C and sanidine is stable above 900° C. In a plutonic rock that cooled very slowly to yield large mineral grains, it's safe to assume that this is microcline.
In the field, workers generally just write down "K-spar" and leave it at that until they can get to the laboratory. Alkali feldspar is generally white, buff or reddish and is not transparent, nor does it show the striations of plagioclase. A green feldspar is always microcline, the variety called amazonite.
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Which object can scratch feldspar but not quartz?
A steel nail can scratch feldspar but not quartz. Feldspar has a hardness of 6 on the Mohs scale, while quartz has a hardness of 7.
What are two feldspars found in granite?
Granite contains plagioclase feldspar and potassium feldspar. It really depends on the composition of the magma from which it forms. If the granite has a lot of pink in it, chances are it is potassium feldspar (K-Spar). If it is dominated by white, then the feldspar is probably plag.
To which mineral group does orthoclase feldspar belong?
Orothoclase Feldspar belong to the silicates group.
What is the scientific name for feldspar?
The scientific name for feldspar is a group name that encompasses several different minerals. The most common type of feldspar found in Earth's crust is potassium feldspar, which has the scientific name KAlSi3O8.
Can talc scratch feldspar?
No, talc is softer than feldspar on the Mohs scale of mineral hardness. Talc has a hardness of 1 while feldspar has a hardness of 6-6.5, which means that feldspar is resistant to being scratched by talc.
What are the uses of microline?
Microline is a type of feldspar mineral that is commonly used in the production of ceramics, glass, and as a decorative stone in jewelry and carvings. It is also used as an industrial mineral in the manufacturing of paints, plastics, and rubber products.
Is microline metallic?
Microline typically refers to a type of fine, thin line or pattern, often used in printing or design. It is not inherently metallic; however, microline designs can be created using metallic inks or materials to give a metallic appearance. The context in which "microline" is used will determine whether it has a metallic characteristic.
Is feldspar dark colored?
Feldspar can come in a variety of colors, including white, pink, gray, brown, and green. Dark colored feldspar varieties, such as labradorite or andesine, can exhibit shades of blue, green, or brown due to their mineral composition and light-reflection properties.
What is the fracture of feldspar?
Feldspar's fracture is brittle
What is feldspar fracture?
The fracture of feldspar is conchoidal or brittle.
What feldspar fracture?
The fracture of feldspar is conchoidal or brittle.
What would happen if you scratched a piece of fluorite against a piece of feldspar?
Fluorite is harder than feldspar, so scratching fluorite against feldspar would cause the fluorite to scratch the feldspar. This means the fluorite would leave a mark on the feldspar, showing that fluorite is harder than feldspar.
What is the feldspar?
Feldspar is a mineral found prety mutch anywhere.
What has feldspar in it?
Feldspar can be found in many things, including soap
What minerals is a silicate Gematite Feldspar Calcite Halite?
Feldspar
Where is feldspar found in NC?
Feldspar is found in North Carolina primarily in the Spruce Pine Mining District, which is located in the western part of the state. This area is known for producing high-quality feldspar, including both potassium feldspar and plagioclase feldspar. The feldspar from this region is used in various industries such as ceramics, glassmaking, and abrasives.
Is feldspar pink?
Feldspar minerals comes in a variety of colors and chemical formulas. The most common pink feldspar is orthoclase.
