A Handbook to the Mineralogy of Cornwall And Devon With Instructions for Their

Cover A Handbook to the Mineralogy of Cornwall And Devon With Instructions for Their
A Handbook to the Mineralogy of Cornwall And Devon With Instructions for Their
J H Joseph Henry Collins
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Angles.
M M' = 92 30' a b = 90 00' Mb 136 15 vb 125 46 Ma 133 45 ea 124 35 ee' 69 10 The combinations most frequently seen are Me, Meb, Meba, Mebav. The faces e and a are frequently uneven.
OPAL.
Amorphous ; massive, reniform, sta- lactitic, &c. ; brittle ; fracture conchoidal, even, or uneven; transparent to trans- lucent on edges ; lustre vitreous, resi- nous, or pearly ; colourless, milk-white, grey, red, brown, blue, green ; often a play of colours as the specimen is moved about ; streak wh
...ite; H. 5 "5-6 '5; G. 1-9-2-3.
Var. A. Common Opal is semi-trans- parent, and the colours are dull.
b. Semi-opal is similar, but less trans- parent, and with still duller colours.
c. Ferruginous Opal (Eisenkiesel or Iron-flint) is a hignly ferruginous variety.
d. Wood-opal has the form and tex- ture of wood, of which it is often a silicified variety.
e. Hyalite or Muller's Glass is vitre- ous, transparent, and colourless.
f. Fire-opal is transparent or semi- transparent ; red or yellow, and irides- cent.


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