Question

What mineral is described below? (Feel free to use the Mineral Key.) - White and glassy in appearance - Mass = 54 grams - Volume = 20 milliliters - Scratches a fingernail but not a penny - White streak - Fizzes in acid

Answer 1

Calcite

Step-by-step explanation:

I took the gizmo test

Answer 2

The mineral is calcite.

Lustre — glassy; ∴ non-metallic

Hardness — between a fingernail (2.5) and a penny (3)

Streak — white

Specific gravity — 54/20 = 2.7

Colour —white

Acid reaction — Fizzes; ∴ a carbonate

The only carbonate mineral that satisfies all these criteria is calcite, CaCO₃.