lab 3 key terms

Question 1

zoning

Answer 1

The variation in composition of a mineral grain going from the center to the outer edge of the mineral.

Question 2

perthitic texture

Answer 2

fine intergrowth of blebs and lamellae of Na plagioclase in K-feldspar.

Question 3

poikilitic texture

Answer 3

a larger mineral that encloses smaller grains of another mineral or a mineral.
can be useful in determining the order of crystallization