Which mineral is the November birthstone (the one described as a silicate mineral of aluminum and fluorine, with Mohs hardness 8) tested in this set?

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Multiple Choice

Which mineral is the November birthstone (the one described as a silicate mineral of aluminum and fluorine, with Mohs hardness 8) tested in this set?

Explanation:
Think about the clues: a silicate mineral of aluminum and fluorine with Mohs hardness 8 points straight to topaz. Its chemical makeup is Al2SiO4(F,OH)2, making it a fluorine-bearing aluminum silicate, and its hardness of 8 is higher than many common minerals. November’s traditional birthstones include topaz and citrine, but citrine is just a yellow variety of quartz (SiO2) with hardness 7 and without fluorine, so it doesn’t fit the described composition. Quartz lacks aluminum and fluorine entirely and is softer than topaz. Garnet is a silicate as well, but it doesn’t have fluorine in its structure, and its hardness range doesn’t match 8. So the mineral that fits all the clues is topaz.

Think about the clues: a silicate mineral of aluminum and fluorine with Mohs hardness 8 points straight to topaz. Its chemical makeup is Al2SiO4(F,OH)2, making it a fluorine-bearing aluminum silicate, and its hardness of 8 is higher than many common minerals. November’s traditional birthstones include topaz and citrine, but citrine is just a yellow variety of quartz (SiO2) with hardness 7 and without fluorine, so it doesn’t fit the described composition. Quartz lacks aluminum and fluorine entirely and is softer than topaz. Garnet is a silicate as well, but it doesn’t have fluorine in its structure, and its hardness range doesn’t match 8. So the mineral that fits all the clues is topaz.

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