RockLicker · Grade 2 · Lesson 1 of 5

Rock or Mineral?

Explain that a rock can contain different minerals and compare a single mineral with a mixed rock.

  • Grade 2
  • 30 minutes
  • Worksheet + teacher guidance
Back to Grade 2

What you will learn

A mineral has a characteristic composition and internal structure. A rock may contain one mineral, several minerals or other natural material; visible grains are a useful starting clue.

Words to use

  • mineral: a natural material with a characteristic structure
  • rock: a natural body of mineral or other geological material
  • grain: a small part visible in a rock

Evidence for this lesson

Known teaching examples: quartz is a mineral. Granite is a rock commonly containing quartz, feldspar and mica; individual samples vary.

Use the supplied record as written; do not invent missing results.

Work through the activity

  1. 5 min · Meet the samplesAn adult identifies the supplied teaching samples as quartz and granite. This lesson uses known samples, not guesses from a photograph.
  2. 10 min · ObserveLook for areas with different colors or textures in the granite. Compare them with the more uniform quartz sample. Record what is visible.
  3. 10 min · Build an explanationDraw the granite with several kinds of grains. Label the quartz as one mineral and the granite as a rock that contains different minerals.
  4. 5 min · Check the ruleDiscuss whether a rock can contain only one mineral. Explain why “all rocks have lots of different minerals” would be too strong.
RockLicker
GRADE 2 · LESSON 1

Rock or Mineral?

Draw on the printed sheet or write, type or dictate your response.
Draw on the printed sheet or write, type or dictate your response.
Draw on the printed sheet or write, type or dictate your response.
Draw on the printed sheet or write, type or dictate your response.

Responses stay in this open page only. Print before closing or changing pages; no student record is stored online.

Check your understanding

Which statement is reasonable?

Teacher & family guide · answers and assessment

Grade 2 · Rock or Mineral?

Learning goal: Explain that a rock can contain different minerals and compare a single mineral with a mixed rock.

Expected responses

  1. Accept glassy or relatively uniform appearance; no exact color is required.
  2. Use visible differences such as light glassy grains and darker flakes, without claiming an unverified ID.
  3. A mineral is a material with characteristic composition and structure; a rock can be made of minerals.
  4. No. A rock can be mostly or entirely one mineral.

Understanding check: A rock can contain several minerals. Rocks can contain mixtures. Shine is a surface clue, not proof of a single mineral.

Watch for this misconception

Grain color alone does not identify the mineral in a real unknown rock.

Assess the evidence

Look for the observations, calculation or explanation named in the learning goal. Accept accurate drawings and dictated responses. Use the expected responses to discuss reasoning; a correct guess without explanation is a starting point for another conversation.

Adapt and extend

Read prompts aloud, enlarge print or let a partner record the learner’s explanation. Draw a rock containing just one kind of mineral and compare it with your granite drawing.