Across
- 3. Pyroxenes have cleavages ____ to each other.
- 6. Three fold rotation axis is common in this system.
- 7. Substances with infinite number of optic axes
- 10. The difference between highest and lowest refractive index is _
- 11. Group of inosilicate in which the cleavages are perpendicular to each other.
- 13. Two minerals with same structure but different chemical formula are _____
- 14. The nesosilicate found in wide varieties of igneous rocks and some metamorphic rocks
- 15. All varieties of plagioclase are grouped structurally in
Down
- 1. Optic figure obtained for a mineral cut parallel to the optic axis is ____ figiure.
- 2. When the ordinary ray refractive index is higher than that of extraordinary ray, the mineral is optically ____
- 4. Magnesium end member of clinopyroxene belonging to monoclinic system
- 5. All minerals belonging to tetragonal and hexagonal system are grouped as optically ___
- 8. Optical group of minerals with more than one principal refractive index
- 9. The mineral to which olivine generally alters to
- 12. The crystal system in which all the three crystallographic axes are of unequal length.