Many specimens of ancient engraved garnets have been found. Friction produces in the stone a positive order of electricity which has a perceptible effect on the magnetic needle. GREENSTONE. (See JADE.) GROSSULARITE. (See GARNET.) HAEMATITE “_The Haematite, named by the Greeks from blood, Benignant Nature formed for mortals’ good._” MARBODUS. The Haematite obtains its name from the Greek HAIMATITES, blood-like. It is a specular iron ore of reddish, brown, steely gray, and iron black colours. Commercially it is spelt Hematite, though it is also written as Ematite, Emathites, Emathitis. Sotacus, described by Pliny as one of the most ancient writers, classified five varieties of haematite, as follows: 1. _Ethiopic_, which he said was a remedy for burns and inflamed eyes. It is probable that this is the Ethiopian Stone, a hard species of flint. (See under FLINT.) 2. Androdamus, or Conquerer of Man, which is given as a remedy for bilious attacks. This stone is described by Sotacus as “very black and heavy,” and by Marbodus as “silvery white with the hardness of a diamond.” It would seem that each writer is describing a different stone. Sotacus’ description would imply a species of iron stone, that of Marbodus may stand for a corundum or even a diamond, and man may be subdued by either the iron stone or the diamond. 3. Arabian, recommended for stomach troubles and burns. 4. Elatite, or when burned Melitite. 5. Mixed stone for eye troubles. The varieties given by Professor James D. Dana are: 1. Specular Iron. Lustre perfectly metallic. 2. Micaceous Iron. Structure foliated. 3. Red Hematite. Submetallic or unmetallic brownish red. 4. Red Ochre. Soft and earthy and often containing clay. 5. Red Chalk. Firmer and more compact than red ochre and of fine texture. 6. Jaspery Clay Iron. A hard, impure, siliceous, clayey ore, having a brownish-red jaspery look and compactness. 7. Clay Iron Stone. The same as the last, the colour and appearance less like jasper. 8. Lenticular Argillaceous Ore. An oolitic red ore consisting of small flattened grains. 9. Martite. Martite is hematite in octahedrons, derived, it is supposed, from the oxidation of magnetite.