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Glacies dura
Metals minerals and metallic preparations · A Chymical Dictionary
At a Glance
The word. A dictionary name for crystal.
In the book. Citrinulus is pale crystal, while Diaphanum names transparency as a quality rather than a substance.
A place to read. The historical definition below, 1650 dictionary, unnumbered definition page 23; facsimile PDF page 351.
Historical Definition
Glacies dura is crystal.
Meaning
The identification gives no source, form or preparation of the crystal. The headword therefore functions as a naming aid, without providing the description needed for a more exact modern mineral identification.
Use in the Book
Citrinulus is pale crystal, while Diaphanum names transparency as a quality rather than a substance. These links help distinguish the general named material from a qualified appearance or a property that many subjects might share. Glacies dura itself supplies only the simple identification.
Places to Read
Citrinulus. A crystal identified through a pale appearance.
Diaphanum. A description of transparency.
Historical source: 1650 dictionary, unnumbered definition page 23; facsimile PDF page 351 — Facsimile
Sources. A Chymicall Dictionary 1650, s.v. Glacies dura
See also. Citrinulus; Diaphanum