quarts / quartz are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
quarts: (noun) a United States liquid unit equal to 32 fluid ounces; four quarts equal one gallon. (noun) a British imperial capacity measure (liquid or dry) equal to 2 pints or 1.136 liters. (noun) a United States dry unit equal to 2 pints or 67.2 cubic inches.
quartz: (noun) a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities.
quarts: k·w·AO·r·t·s
quartz: k·w·AO·r·t·s
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)