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A fact for the #etymology nerds! The word quartz describes one of its physical properties. It comes from the German word "Quarz" which has origins in various Slavic words for "hard" (e.g., Czech "tvrdý", Polish "twardy", Serbian/Croatian "tvrd"). Quartz is a pretty hard mineral as it's 7 on the Mohs hardness scale

#mineral #minerals #MinCup23 #TeamQuartz @MineralCup 2/?
The Mohs hardness scale. The left column shows the hardness of minerals: Talc is 1, gypsum is 2, calcite is 3, fluorite is 4, apatite is 5, orthoclase is 6, quartz is 7, topaz is 8, corundum is 9, diamond is 10.

The right hand column shows the hardness of various everyday objects: A fingernail is 2.5, a copper penny is 3.5, a knife/glass plate is 5.5, a steel nail is 6.5, a masonry drill bit is 8.5.