By Frederic Phillip Mennell
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Extra info for A Manual of Petrology
Regular. 4. 5| Gelatinize with HC1, and become blue, if not already so, on heating in sulphur vapour. , Lapis In the case of hauyne, even colourless Lazuli), in slices. sections are varieties usually show local patches of blue rarely found except generally rectangular or hexagonal in definite crystals. Zoning is common, parts of the and ; calcite, etc. ; ; crystal being frequently dusty-looking and almost opaque, owing to inclusions. These two minerals are occasionally found in intermediate and basic rocks, also in metamorphosed limestones, sometimes forming patches of lapis lazuli.
TiO2 .. FeO .. MnO MgO .. .. 00 G = Shows sub-metallic Opaque. considerably FIG. duller 16. 86 lustre than magnetite. 25 by reflected light Crystallizes, ; like SKELETON CRYSTAL OF ILMENITE. Porphyrite, Wood's Point, Victoria, Australia. Australia. X 60 diam. haematite, in rhombohedral or tabular forms ; skeleton Frequently granular, often in very crystals are common. Plane of parting parallel to irregular branching forms. the rhombohedral faces, becoming more strongly marked A MANUAL OF PETROLOGY 37 through decomposition, as the leucoxene to which it gives rise extends most readily along this plane.
Optic tube of the microscope with its optic axial plane at 45 to the principal sections of the nicols, as indicated by FIG. 10. Determination of Sign. (After Rosenbusch). In two diagonally opposite quadrants the cross wires. the rings of the interference figure will be shifted towards In the the centre, and in the other two away from it. case of a positive crystal, the rings contract where crossed by the axial plane of the mica, and expand in a direction For a negative crystal the reverse at right angles to it.
A Manual of Petrology by Frederic Phillip Mennell