A geologist examines two rock samples: one is a block of pure limestone and another is a granite containing f…

Question

A geologist examines two rock samples: one is a block of pure limestone and another is a granite containing feldspar, quartz and mica. How do these samples differ in their mineral composition, and what does this tell us about the relationship between rocks and minerals?

Accepted Answer

## Model Answer **Limestone** consists of only a **single mineral**, making it a monomineralic rock. In contrast, **granite** is composed of **multiple minerals** — feldspar, quartz, and mica — combined in varying proportions. This difference illustrates the key relationship between rocks and minerals: **rocks are combinations of homogenous substances called minerals.** While most rocks consist of several minerals, some like limestone consist of just one. Minerals are homogenous, naturally occurring substances with a definable internal structure, and rocks are essentially their assemblages. *Source: Chapter 5 — What is a mineral?* --- ## Explanation - The examiner expects you to use the textbook definition of both 'mineral' and the rock–mineral relationship directly. - Key phrase to include: *"rocks are combinations of homogenous substances called minerals."* - Contrast the two samples clearly (single mineral vs. multiple minerals) — that is the core of the question. - Do not over-exp…

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