Descriptive Mineralogy
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Its best known occurrences are in Allemont, Dauphine; Annaberg and Schneeberg, Saxony; Cobalt, Ontario, and mines in Colorado and Nevada.
Variscite (A1PO 4 -2H 2 O) Variscite is a bright green mineral that has recently come into use as a gem material. It is apparently an aluminium phosphate with a theoretical composition as follows: 44. 9 per cent P 2 Os; 32. 3 per cent Al 2 Os and 22. 8 per cent H 2 O. A specimen of crystallized material from Lucin, Utah, gave the following analysis: A1 2 O 3 ...Fe 2 O 3 CrO 3 V 2 O 3 H 2 O Total 44. 73 32. 40 . 06 . 18 . 32 22. 68 100. 37 Recent investigations indicate that the compound A1PO 4 2H 2 O is dimorphous. Both forms are orthorhombic but one, variscite, has the properties described under this heading. The other, lucinite, is associ- ated with variscite, near Lucin, Utah. It, however, occurs in crystals that are octahedral in habit, rather than tabular, and that have an axial ratio of . 8729 : i : . 9788. In other respects lucinite is very much like variscite.
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To quickly assess the difficulty of the text, read a short excerpt:
Its best known occurrences are in Allemont, Dauphine; Annaberg and Schneeberg, Saxony; Cobalt, Ontario, and mines in Colorado and Nevada.
Variscite (A1PO 4 -2H 2 O) Variscite is a bright green mineral that has recently come into use as a gem material. It is apparently an aluminium phosphate with a theoretical composition as follows: 44. 9 per cent P 2 Os; 32. 3 per cent Al 2 Os and 22. 8 per cent H 2 O. A specimen of crystallized material from Lucin, Utah, gave the following analysis: A1 2 O 3 ...Fe 2 O 3 CrO 3 V 2 O 3 H 2 O Total 44. 73 32. 40 . 06 . 18 . 32 22. 68 100. 37 Recent investigations indicate that the compound A1PO 4 2H 2 O is dimorphous. Both forms are orthorhombic but one, variscite, has the properties described under this heading. The other, lucinite, is associ- ated with variscite, near Lucin, Utah. It, however, occurs in crystals that are octahedral in habit, rather than tabular, and that have an axial ratio of . 8729 : i : . 9788. In other respects lucinite is very much like variscite.
What to read after Descriptive Mineralogy?
You can find similar books in the "Read Also" column, or choose other free books by William Shirley Bayley to read onlineMoreLess
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