Mineralogy

Use this for “Halite is cubic with a = 5.640 Å. Find the spacing of its (200) planes and their 2θ peak with copper Kα.”

Use this for “Halite (58.44 g/mol) is cubic with a = 5.640 Å and 4 NaCl units per cell. Find its density.”

Use this for “Zircon’s cell has a = b ≠ c with every angle 90°. Which crystal system is it?”

Use this for “A plagioclase has 0.6 Ca and 0.4 Na per 8 oxygens. Name it and balance its charge.”

Use this for “Which mineral class does pyrite, FeS₂, belong to?”

Use this for “Garnet has n = 1.77 and the mounting medium 1.54. Is its relief low, moderate or high?”

Use this for “A grain stays dark under crossed polars as the stage turns. Could it be quartz, or is it garnet?”

Use this for “Convert a sand grain 0.2 mm across to the φ scale and name its Wentworth class.”