Crossword-Solution: PYRITE 6 letters, 13 clues 🏆 scrabble score: 11

Sulphuric Acid made on a Large Scale involves the same principles as shown in Experiment 55, excepting that S02 is obtained by burning S or roasting FeS2 (pyrite), [Fig.

ARGILLITE, ARESENIC, ARSENOPYRITE, Barite, CALCITE, CASSITERITE, CHALCOPYRITE, CHALK, CINNABAR, COPPER (native), Corundum, Dolomite, EMERY, FELDSPAR, Flint, GALENITE, GRANITE, GRAPHITE, GYPSUM, HEMATITE, Hornblende, Jasper, LIMONITE, MAGNESITE, MAGNETITE, MALACHITE, Meerschaum, MICA, OBSIDIAN, Orpiment, PYRITE, QUARTZ, Realgar, SAND, SERPENTINE, SIDERITE, SPHALERITE, Talc, ZINCITE Metals and Alloys.

Below the zone of surface changes the ore of a copper vein is often a double sulphide of iron and copper called CHALCOPYRITE, a mineral softer than pyrite--it can easily be scratched with a knife--and deeper yellow in color.

The ore itself is a fine-grained pyrite, with a grayish color, and it is well suited by its sulphur and low copper contents, as well as by its properties for heap roasting.

But if the phosphate is treated with sulfuric acid it becomes more soluble and this product is sold as "superphosphate." The sulfuric acid is made mostly from iron pyrite and this we have been content to import, over 800,000 tons of it a year, largely from Spain, although we have an abundance at home.