Discussion

Match the following :

I	II
(1) Cumulus texture	(i) Banding and crustification in open space
(2) Exsolution texture	(ii) Protuberances of replacing minerals with replaced host
(3) Caries texture	(iii) Spindles or lamellae of one mineral in another
(4) Cockade texture	(iv) Aggregates of minerals with non-penetrative mineral boundaries

Answer: A

The correct matching is (1)-(iv), (2)-(iii), (3)-(ii), (4)-(i).

Cumulus texture: crystals that settled or accumulated together, forming aggregates touching along simple, non-penetrative boundaries.
Exsolution texture: lamellae or spindles of one mineral within another, formed when a solid solution unmixes on cooling, such as pentlandite flames in pyrrhotite.
Caries texture: a replacing mineral eats into the host along embayed, scalloped edges, like decay in a tooth.
Cockade texture: concentric crusts grown around rock fragments in open spaces, banding and crustification.

Every other code swaps at least two of these.

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