varieties, we shall notice that these three ingredients have each more or less definite crystalline forms; so that they are not distinguished by colour and hardness alone. The metallic-looking substance is mica; the hard gray, or glassy and unscratchable ingredient is quartz; and the remaining material is felspar. The mineralogist's analysis of granite ends here. But there is still much to be learned about quartz, felspar, and mica; for, as the chemist will tell us, these are not 'elementary substances.' Quartz is a compound, consisting of two elements, one of which is a non-metallic body (silicon), and the other an invisible gas (oxygen). Felspar[A] is a still more complex compound, being made up of two metals (potassium, aluminium) and one non-metallic body (silicon), each of which is united to an invisible gas (oxygen). Mica, again, contains no fewer than four metals (potassium, magnesium, iron, calcium) and one non-metallic body (silicon), each of which is in like manner chemica
After finding the body of a dragon in a metalli... Read more
*This is a stand-alone book in the Fearsome Ser... Read more
Fans of the Hunger Games and Sci-Fi Thrillers will... Read more
While rumors of monsters rising in the south bring... Read more
See it as donating a moment of your social media time, every little thing helps us improve and stay online.
The list of books below is based on the weekly downloads by our users regardless of eReader device or file format.
See more popular titles from this genre.