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Quartz Crystals

Short answer: Quartz is silicon dioxide (SiO2) and one of the most common minerals in Earth's continental crust. It forms hexagonal crystals and comes in many varieties; clear, colorless quartz is called rock crystal.

Quartz is piezoelectric: mechanical stress produces an electric charge, and an applied voltage makes it flex. Quartz clocks and watches use this, driving a small crystal resonator, usually tuned to 32,768 Hz, and counting its vibrations to keep time. The footage shows quartz crystals, a demonstration spark and a watch movement, with the presenter.

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In collections:Everyday Physics

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What should you know about Quartz Crystals?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. Quartz is silicon dioxide.

    DD-168-F01 · Write-up · Exhibit A (Silicon dioxide)

  2. It's one of the most common minerals in the crust.

    DD-168-F02 · Write-up · Exhibit B (Common mineral)

Video transcript: Quartz Crystals: Squeeze a Quartz Crystal and It Makes Electricity

Quartz is a common mineral found in the Earth's crust and comes in various forms and colors. DID YOU KNOW? One of the most well-known varieties is rock crystal quartz known for its clear and transparent appearance. Quartz crystals have a hexagonal structure and are composed of silicon and oxygen atoms. One fascinating property of quartz is its piezoelectricity. When subjected to mechanical stress or pressure quartz crystals generate a small electric charge. This property is utilized in various technologies including quartz watches where the vibrations of a quartz crystal help maintain accurate timekeeping. NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 31.6s Reel ·

Video coming soonQuartz Crystals · Instagram Reel
Quartz Crystals: Squeeze a Quartz Crystal and It Makes Electricity Instagram Reel · · 31.6s

The write-up

Squeeze a quartz crystal and it makes electricity. Quartz watches count the vibrations of a tiny crystal.

  1. Exhibit A

    Silicon dioxide

    Quartz is silicon dioxide.

  2. Exhibit B

    Common mineral

    It's one of the most common minerals in the crust.

  3. Exhibit C

    Rock crystal

    Clear quartz is called rock crystal.

  4. Exhibit D

    Piezoelectric

    Stress makes quartz produce a charge.

  5. Exhibit E

    Timekeeping

    Quartz watches count a crystal's vibrations.

Questions people ask about Quartz Crystals

What is quartz made of?

SiO2.

Source: Write-up · Exhibit A (Silicon dioxide) · Wikipedia: Quartz

How common is quartz?

Among the most common minerals.

Source: Write-up · Exhibit B (Common mineral) · Wikipedia: Quartz

What's clear quartz called?

Colorless and transparent.

Source: Write-up · Exhibit C (Rock crystal) · Wikipedia: Quartz

What happens when quartz is squeezed?

Piezoelectricity.

Source: Write-up · Exhibit D (Piezoelectric) · Wikipedia: Quartz; Wikipedia: Piezoelectricity

Where is quartz used for timing?

It vibrates at a steady rate.

Source: Write-up · Exhibit E (Timekeeping) · Wikipedia: Quartz; Wikipedia: Piezoelectricity

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. What is quartz made of?

    1. Silicon and oxygen
    2. Carbon
    3. Iron and sulfur
    4. Aluminum
    Show the answer

    Answer: A. Silicon and oxygen SiO2. Source: Write-up · Exhibit A (Silicon dioxide) · Wikipedia: Quartz

  2. How common is quartz?

    1. Very common in the crust
    2. Extremely rare
    3. Only in meteorites
    4. Only underwater
    Show the answer

    Answer: A. Very common in the crust Among the most common minerals. Source: Write-up · Exhibit B (Common mineral) · Wikipedia: Quartz

  3. What's clear quartz called?

    1. Rock crystal
    2. Amethyst
    3. Opal
    4. Jade
    Show the answer

    Answer: A. Rock crystal Colorless and transparent. Source: Write-up · Exhibit C (Rock crystal) · Wikipedia: Quartz

  4. What happens when quartz is squeezed?

    1. It produces a charge
    2. It melts
    3. It glows red
    4. Nothing
    Show the answer

    Answer: A. It produces a charge Piezoelectricity. Source: Write-up · Exhibit D (Piezoelectric) · Wikipedia: Quartz; Wikipedia: Piezoelectricity

  5. Where is quartz used for timing?

    1. Watches and clocks
    2. Car tires
    3. Paint
    4. Glass bottles
    Show the answer

    Answer: A. Watches and clocks It vibrates at a steady rate. Source: Write-up · Exhibit E (Timekeeping) · Wikipedia: Quartz; Wikipedia: Piezoelectricity

Cite this case file

Easterling, Marcus. "Quartz Crystals." The Detail Department (DetailEnjoyer), case file DD-168, last updated Jan 8, 2024. https://detailenjoyer.com/case/quartz-crystals/

Permalink: https://detailenjoyer.com/case/quartz-crystals/ · Last updated

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Cite a single fact by its ID, for example DD-168-F01 → https://detailenjoyer.com/case/quartz-crystals/#DD-168-F01

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