# ESRT Workbook: Set 2 - Properties of Common Minerals.Which two minerals have cleavage planes at right angles?(1) biotite mica

###### Question:

ESRT Workbook: Set 2 - Properties of Common Minerals. Which two minerals have cleavage planes at right angles?
(1) biotite mica and muscovite mica
(2) sulfur and amphibole
(3) quartz and calcite
(4) potassium fledspar and pyrixene

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