GEOLOGY - CHAPTER2 (FELDSPAR) Flashcards
are a group of minerals having a crystalline form. These are one of the most abundant minerals
found in the Earth’s crust.
FELDSPAR
is derived form the word ‘Feldspat’, of German origin.
FELDSPAR
It is extracted from large granite
formations.
plutons.
it is also extracted from sands and
pegmatites
plutons
is the name of the group of minerals that form a solid solution series ranging from pyre albite and
pure anorthite.
Plagioclase
2 TYPES OF FELDSPAR
plagioclase and alkali.
1.PLAGIOCLASE FELDSPAR
These minerals have a triclinic structure.
Anorthite
Bytownite
Labradorite
- ALKALI FELDSPAR
It is a mixture of sodium aluminosilicate and potassium aluminosilicate. These minerals have a monoclinic or a
triclinic structure.
MICROCLINE
ANORTHOCLASE
ORTHOCLASE
SANIDINE
– It is mostly found in igneous rocks, and used in making ceramics and cement.
Anorthite
This mineral is one of the rarest types of feldspar.
Bytownite
This mineral is used in tiling, making kitchen counters, and ornaments.
Labradorite
With a triclinic arrangement, these minerals have a mild-pink to salmon color. Some of
its varieties―such as amazonite―can be used as gemstones. Microcline is one of the most common
feldspar minerals
MICROCLINE
It has a triclinic formation. It is found in various colors such as yellow, green, or
grayish pink. A variety of microcline, rich in sodium and sometimes having a play of color: sometimes
considered a variety of orthoclase.
ANORTHOCLASE
– It has a monoclinic structure. These minerals are used in the manufacture of polymers,
to make gemstones, and for fashion jewelry.
ORTHOCLASE
– It has a monoclinic arrangement. This mineral is known to be stable at high temperatures.
Its yellow colored variant is used to make gemstones.
SANIDINE
-contains alumina, which results in an increase in the strength of the manufactured product.
Therefore, this mineral is used in glass-making.
➢ It is used as a filler agent for plastic, rubber, and paint.
➢ It is used to make porcelain, sanitary ware, and tableware.
➢ It is used in making mild abrasives, latex foam, and urethane.
➢ This mineral is used in the manufacture of ceramics. It imparts durability and hardness to ceramic
products.
FELDSPAR
helps engineers to determine the strength of materials used in
construction of roads. It can be used as an aggregate that helps bind together gravel into larger pieces that can
be used as fill material or road base material. It also helps to make concrete more durable and resistant to
weathering. It has a high melting point and can withstand high temperatures
