Which of the following minerals is considered as the softest?
a. Fluorine
b. Talc
c. Gypsum
d. Halite
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Which of the following minerals is considered as the softest?
a. Fluorine
b. Talc
c. Gypsum
d. Halite
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SOFTEST MINERALS
ANSWER: B. Talc
Among the choices, talc is considered the softest mineral as it can be scratched by other minerals. Talc has physical and chemical properties, the reason why it is considered the softest. Talc is composed of sheet structures with perfect bond cleavages and very weak bond forces between the sheets. Due to these structural traits, talc sheets can easily slip on one another. This characteristic of talc gives it extreme softness. Talc is a phyllosilicate mineral that cleaves into thin sheets. These sheets are held together only by van der Waals bonds, which allows them to easily slip past one another. This characteristic is responsible for talc's extreme softness, its greasy to soapy feel, and its value as a high-temperature lubricant.
Why is talc the softest mineral?
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