Perlite (quarry operation)

The activity generating the emissions is perlite quarry operation. The Reference Product is perlite. The product "perlite" represents a natural glass that is usually black or gray, but sometimes brownish red. It has curved shrinkage cracks, and therefore breaks up into spheroidal granules. It is usually produced by rapid cooling of rhyolitic melts (rhyolite being the volcanic equivalent of granite). Being a glass, perlite contains few crystals and has a low water content. Naturally-occurring glasses containing 3 - 8 % water are known as pitchstone. Perlite is usually used in its expanded form. The Reference Product amount is 1. The cut-off classification is allocatable product. The activity type is ordinary transforming activity. Please refer to the ecoinvent documentation for full details: https://ecoquery.ecoinvent.org/3.12/cutoff/dataset/7878/documentation