X. Speak on minerals and the process of their identification.
Use the following words:
property, depend on, specific gravity, to range, crystall fall into, angle, break, cleavage hardness,
to tell apart, arbitrary scale, streak, powdered mineral, to confuse, to reflect, fluorescence,
magnetic, electrical properties, hornblende, common, amphibole, agate, similar-looking
pyroxene, confuse, the cleavage angles;
XI.
Describe the class of silicates:
a) quartz, b) feldspar, c) zeolite.
Speak on their properties and industrial use.
XII. Speak on your first laboratory exploration of minerals.
Use the words from the active vocabulary.
The twelfth lesson.
First translate words in bold, then the whole text and retell
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