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Petalite, also known as Castorite, is a lithium phyllosilicate mineral. It has a Moh's scale hardness of 6. Pelalite can be converted into quartz and spodumene through a special heating process. As such, it is useful in creating glass.
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Olivine is a magnesium iron silicate with a Moh's scale hardness of 7. It can be found extraterrestrially and it's properties make it a good candidate for removing CO2 from the atmosphere. It is, in a way, related to Peridots.
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