Which of the following is not a true statement about mineral properties?

- Calcite dissolves rapidly releasing visible bubbles of carbon dioxide gas so the acid test is useful for identifying if the mineral calcite is present.
- Luster is the way in which a mineral reflects light.
- Some minerals have a natural magnetism such as a magnetite which is why geologists test minerals with magnets to check for this characteristic.
- Pyrite has a metallic luster and is a yellowish mineral but it will not streak the same color as gold.
- Fluorescent minerals emite visible light when they are exposed to radiation.

Please explain!

Question

30-07-2022
Geography

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Which of the following is not a true statement about mineral properties?

- Calcite dissolves rapidly releasing visible bubbles of carbon dioxide gas so the acid test is useful for identifying if the mineral calcite is present.
- Luster is the way in which a mineral reflects light.
- Some minerals have a natural magnetism such as a magnetite which is why geologists test minerals with magnets to check for this characteristic.
- Pyrite has a metallic luster and is a yellowish mineral but it will not streak the same color as gold.
- Fluorescent minerals emite visible light when they are exposed to radiation.

Please explain!

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Baraq Baraq · Answer 1 · 2022-08-01T17:16:57+02:00

The sentence that is not a true statement about mineral properties is option A. Calcite dissolves rapidly releasing visible bubbles of carbon dioxide gas so the acid test is useful for identifying if the mineral calcite is present. Hence, the correct answer is option A. Read below why option A. is the sentence that is not true of the minerals.

Why is option A not true?

The bubbling release of carbon dioxide gas is so weak that one needs a hand lens to observe single bubbles slowly growing in the drop of hydrochloric acid - or so vigorous that a flash of effervescence is produced. This is the case as against the proposition stated in the option that it is visible whereas, it is not visible without a hand lens.

Therefore the correct answer is as given above.

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