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Quartz vs. Feldspar: What's the Difference?

Edited by Aimie Carlson || By Harlon Moss || Published on December 16, 2023
Quartz is a hard, crystalline mineral composed of silicon and oxygen, while feldspar is a group of rock-forming minerals that contain varying amounts of potassium, sodium, and calcium.

Key Differences

Quartz is a mineral consisting of silicon dioxide (SiO2), with a hard, crystalline structure. Feldspar is a group of minerals containing silicates of potassium, sodium, and calcium, with varying crystal structures.
Quartz is known for its hardness (7 on the Mohs scale) and resistance to weathering. Feldspar, though also hard (6-6.5 on the Mohs scale), is less resistant to weathering than quartz.
Quartz is abundant and found in many rock types, including igneous, metamorphic, and sedimentary rocks. Feldspar is the most abundant mineral group in the Earth's crust, particularly in igneous rocks.
Quartz is used in glassmaking, electronics, and as gemstones. Feldspar is used in ceramics and glass production and also as a filler in paints and plastics.
Quartz comes in various forms, including clear, amethyst, and rose quartz. Feldspar minerals vary in color and include orthoclase, plagioclase, and microcline, each with distinct properties.

Comparison Chart


Silicon dioxide (SiO2)
Silicates of potassium, sodium, calcium

Hardness (Mohs Scale)


Resistance to Weathering

Less than quartz

Common Uses

Glassmaking, electronics, gemstones
Ceramics, glass production, fillers


Various forms and colors, often clear or colored
Varied, includes orthoclase, plagioclase, microcline

Quartz and Feldspar Definitions


A hard, crystalline mineral made of silicon dioxide.
The geologist found a beautiful, clear quartz crystal in the cave.


A group of rock-forming minerals containing potassium, sodium, and calcium.
Granite contains feldspar, giving it a unique and attractive pattern.


Quartz is known for its durability and resistance to weathering.
The quartz countertops remained unscathed despite years of use.


The most abundant mineral group in the Earth's crust.
The mountain range was rich in feldspar minerals, crucial for the local industry.


Quartz is used in making glass and as a component in electronic devices.
Quartz is essential in the production of high-quality glassware.


Feldspar is less hard than quartz and less resistant to weathering.
The weathered statue showed signs of erosion, mostly in its feldspar components.


A natural mineral that comes in various colors and forms, like amethyst.
Her necklace was adorned with a purple amethyst, a type of quartz.


Feldspar is used in the manufacturing of ceramics and glass.
The pottery class used feldspar in their clay mixture for better durability.


A widely used mineral in jewelry as gemstones.
The quartz gemstones added a sparkling elegance to the ring.


Feldspar minerals vary in color, including orthoclase and plagioclase types.
The distinctive pink hue of orthoclase feldspar was apparent in the rock sample.


A very hard mineral composed of silica, SiO2, found worldwide in many different types of rocks, including sandstone and granite. Varieties of quartz include agate, chalcedony, chert, flint, opal, and rock crystal.


Any of a group of abundant rock-forming minerals occurring in igneous, metamorphic, and sedimentary rocks, and consisting of silicates of aluminum with potassium, sodium, calcium, and, rarely barium. About 60 percent of the earth's outer crust is composed of feldspar.


(mineral) The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO2. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.


(mineral) Any of a large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks.


Crystal meth: methamphetamine hydrochloride.


A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish.


A form of silica, or silicon dioxide (SiO2), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque.


Any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium


Colorless glass made of almost pure silica


A hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities


How hard is quartz?

It has a hardness of 7 on the Mohs scale.

What is quartz?

A hard, crystalline mineral composed of silicon dioxide.

What are the common uses of feldspar?

Used in ceramics, glass production, and as fillers.

What are the main uses of quartz?

Used in glassmaking, electronics, and as gemstones.

Is quartz resistant to weathering?

Yes, it's highly resistant to weathering.

How hard is feldspar?

It has a hardness of 6-6.5 on the Mohs scale.

Where is feldspar commonly found?

Primarily in igneous rocks like granite.

Can quartz be found in different colors?

Yes, it comes in various colors, including clear, amethyst, and rose quartz.

Is quartz more durable than feldspar?

Yes, quartz is more durable and weather-resistant.

What is feldspar?

A group of rock-forming minerals containing silicates of potassium, sodium, and calcium.

What are the types of feldspar?

Types include orthoclase, plagioclase, and microcline.

Is feldspar abundant in the Earth's crust?

Yes, it's the most abundant mineral group in the crust.

Can quartz be used in making jewelry?

Yes, it's often used as gemstones in jewelry.

Do quartz and feldspar appear together in rocks?

Yes, they're often found together in rocks like granite.

What role does feldspar play in ceramics?

It helps in forming the body of ceramics and improves durability.

What makes quartz and feldspar different?

They differ in composition, hardness, uses, and appearance.

Are there synthetic forms of quartz?

Yes, synthetic quartz is produced for various industrial applications.

Can feldspar be a gemstone?

Certain types, like moonstone, are used as gemstones.

Is quartz found in sedimentary rocks?

Yes, it's found in many rock types, including sedimentary rocks.

Can feldspar be used in electronic applications?

No, it's primarily used in ceramics and glass production.
About Author
Written by
Harlon Moss
Harlon is a seasoned quality moderator and accomplished content writer for Difference Wiki. An alumnus of the prestigious University of California, he earned his degree in Computer Science. Leveraging his academic background, Harlon brings a meticulous and informed perspective to his work, ensuring content accuracy and excellence.
Edited by
Aimie Carlson
Aimie Carlson, holding a master's degree in English literature, is a fervent English language enthusiast. She lends her writing talents to Difference Wiki, a prominent website that specializes in comparisons, offering readers insightful analyses that both captivate and inform.

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