variscite
mineral
phosphate mineral, hydrated aluminum phosphate (AlPO4·2H2O), which is valued as a semiprecious gemstone and an ornamental material. Both variscite and strengite, a similar mineral in which iron replaces aluminum in the crystal structure, occur as glassy nodules, veins, or crusts, in near-surface deposits: variscite is produced by the action of phosphate-rich waters on aluminous rocks, and strengite by alteration of iron-containing phosphates. Variscite is usually green; strengite, red. Variscite occurs in Germany, Austria, Czech Republic, Congo (Kinshasa), and Australia and in commercially important quantities near Fairfield, Utah, U.S. It also occurs with apatite on islands where phosphatic solutions from guano (seafowl excrement) have altered aluminous igneous rocks. Strengite deposits are known in Germany, Portugal, Sweden, and the United States. For detailed physical properties, see phosphate mineral (table).Variscite is cut en cabochon (cabochon cut) (with a round, convex, polished surface) for brooches, earrings, and beads and is frequently substituted for turquoise. It also is carved into bowls or other decorative objects. Because of its porosity, it tends to absorb grease and oil, which discolour it.
- Arniches, Carlos
- Arnim, Achim von
- Arnim, Bettina von
- Arnim, Hans Georg von
- Arnim, Harry, Graf von
- Arnobius The Elder
- Arnold Arboretum of Harvard University
- Arnold, Benedict
- Arnold Bennett
- Arnold Brecht
- Arnold Böcklin
- Arnold Dolmetsch
- Arnold Fitzthedmar
- Arnold Gesell
- Arnold Geulincx
- Arnold, Harold DeForest
- Arnold Henry Guyot
- Arnold, Henry Harley
- Arnold Houbraken
- Arnold, Matthew
- Arnold Newman
- Arnold of Brescia
- Arnold Palmer
- Arnold Rothstein
- Arnold, Samuel