What makes moldavite compatible with borosilicate glass while other crystals are not?

Home Frequently Asked Questions (FAQ) Glass What makes moldavite compatible with borosilicate glass while other crystals are not?

It all comes down to the COE of the elements put in the glass.  Boro is 33 so it must be very very close to this or it will crack the glass as it cools.

Moldavite is actually very close to borosilicate glass molecularly (both mostly composing of SiO2), making it more stable for blowing compared to other crystals.

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