Question

John investigated the properties of two minerals and recorded his observations:

Feldspar is a gray, dull, solid that has flat surfaces.
Calcite is a white, dull, solid that has flat surfaces.

What evidence could John use to conclude that both minerals are non-metallic? (2 points)
a
Both minerals are dull.

b
Both minerals are solids.

c
Both minerals have flat surfaces.

d
Feldspar is gray, while calcite is white.

Answer 1

Feldspar and calcite can be concluded to be non-metallic minerals based on their a. dull appearance.

Step-by-step explanation:

Minerals are naturally occurring, inorganic substances with a defined chemical composition and crystalline structure. They play crucial roles in geological processes and are vital for various industrial applications. Examples include quartz, feldspar, and calcite, each possessing unique physical and chemical properties.

John could use the evidence that both minerals are dull to conclude that they are both non-metallic. Luster is a property of minerals that describes how they interact with light. Metallic minerals do not allow light to pass through their atomic structure, while non-metallic minerals allow some light to pass through. Since both feldspar and calcite are dull and do not have a shiny or metallic appearance, it indicates that they are both non-metallic minerals.