quartz

Geology Science 15 of 15 appearances
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"quartz" appearances by year

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All Geology clues by year

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# Clue Answer As Given Value Round Category Air Date Show
When clear & colorless, this common mineral is known as rock crystal quartz $600 J MINERALOGY 2025-05-12 #9331
This mineral whose crystals can be used to keep accurate time precedes "crisis" in the history of 1970s Swiss watchmaking quartz $800 DJ MINERALS 2024-11-13 #9203
This mineral that is used in kitchen countertops could get a minimum of 24 points in Scrabble quartz $400 DJ WAIT JUST A MINERAL! 2022-10-04 #8712
Thismineral was called krystallos by the ancient Greeks & is primarily silicon dioxide quartz $800 DJ ROCKS & MINERALS 2022-02-03 #8569
Around 1920 plates of this silicon mineral were first used to control radio frequencies quartz DD $2,000 DJ ROCKS & MINERALS 2003-01-01 #4223
Granite is composed mainly of feldspar & this transparent crystalline material quartz $600 DJ GEOLOGY 2001-07-10 #3897
Amethyst is an example of this mineral, nearly pure silicon dioxide quartz $800 DJ ROCKS & MINERALS 1996-06-17 #2731
Sandstone grains are made up of mainly feldspar & this mineral quartz $800 DJ ROCKS & MINERALS 1995-05-08 #2471
Agate, jasper & bloodstone are all forms of this silica mineral quartz $1,000 DJ GEMS & JEWELRY 1995-02-02 #2404
Of quartz, calcite, or mica, the one which has no cleavage quartz $300 J ROCKS & MINERALS 1992-02-17 #1726
Granite is made up mainly of feldspar & this mineral which appears as transparent crystals quartz $400 DJ GEOLOGY 1992-01-22 #1708
This mineral, especially when transparent, is called rock crystal quartz $800 DJ ROCKS & MINERALS 1991-02-18 #1496
Onyx, jasper & agate are varieties of this mineral quartz $800 DJ GEMS 1990-10-24 #1413
The Greeks called this mineral "krystallos", which is where we got the word crystal quartz $800 DJ ROCKS & MINERALS 1989-02-08 #1028
Rock crystal is the clear form of this mineral quartz $400 DJ GEOLOGY 1988-10-10 #941
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