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
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In our eReader you can find the full English version of the book. Read A Handbook to the Mineralogy of Cornwall And Devon With Instructions for Their Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Handbook to the Mineralogy of Cornwall And Devon With Instructions for Their
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To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after A Handbook to the Mineralogy of Cornwall And Devon With Instructions for Their?
You can find similar books in the "Read Also" column, or choose other free books by J H Joseph Henry Collins to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after A Handbook to the Mineralogy of Cornwall And Devon With Instructions for Their?
You can find similar books in the "Read Also" column, or choose other free books by J H Joseph Henry Collins to read onlineMoreLess
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