Question

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1. from a visual inspection, which rocks or minerals appear to be composed of crystals?

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Explanation:

Crystalline materials have distinct, geometric, often flat-faced structures with ordered internal atomic arrangements. Visual inspection shows the following have these traits:

1. Top-left (blue-green mineral): Has sharp, flat crystal faces.
2. Top-right (pale mineral): Shows a distinct, geometric, flat-sided crystalline shape.
3. Bottom-right (red mineral): Has clear, well-defined crystal edges and faces.
4. Bottom-left (gray mineral): Displays visible crystalline facets and an ordered structure.

The dark irregular rock (middle-right) and brownish rock (middle-left) lack these distinct geometric crystalline features, appearing more amorphous or fragmentary.

Answer:

The top-left blue-green mineral, top-right pale mineral, bottom-right red mineral, and bottom-left gray mineral appear to be composed of crystals.