Meanings of diaphaneity in English

Even the best scryers often fail to see anything in the crystal which maintains its natural 'diaphaneity,' as Dr. Dee says.

What had been leanness in her youth had become transparency in her maturity; and this diaphaneity allowed the angel to be seen.

I believe (he continues) that 'consciousness,' when once it has evaporated to this estate of pure diaphaneity, is on the point of disappearing altogether.