hand specimen meaning in Hindi

Examples

1. Their black augite and yellow green olivine are also easily observed in hand specimens.
2. It may be difficult to distinguish cummingtonite from the Mg rich variety in hand specimens.
3. More commonly there is a distinct spotting, visible on the surfaces of the hand specimens.
4. In most cases, a hand specimen of the rock is accompanied by a thin section.
5. The ferromagnesian minerals rarely occur in large crystals, and are usually not conspicuous in hand specimens of these rocks.
6. It is difficult to distinguish the two in hand specimens, and often requires microscopic examination to identify the differences.
7. Crystals of cryptoperthetic orthoclase up to 1 cm in length can be seen in hand specimens throughout most of the OPM units.
8. Sodalite, colorless and transparent in thin section, but frequently pale blue in the hand specimens, is the principal feldspathoid mineral in addition to nepheline.
9. Both examples show large rounded spots in the hand specimens; they are pseudoleucites, and under the microscope prove to consist of orthoclase, nepheline, sodalite and decomposition products.
10. It has a hardness of 4.5-5.5 on the Mohs scale of mineral hardness and aside from having a slightly lower hardness, it may be difficult to distinguish it from turquoise in hand specimens.