ACTIVITY 5.2 Minerals That Form Igneous Rocks Name: Course/Section: Date Using t

Question

ACTIVITY 5.2 Minerals That Form Igneous Rocks Name: Course/Section: Date Using the Minerals Database (pages 93-97), look up each mineral name listed below and identfify its picture below. Below cach picture, write the name of the mineral, its chemical composition (chemical formula or chemical name), and words that describe it in a way that you will be able to recognize it. (All samples below are shown at their actual size, xl.) A. Augite (pyroxene) Biotite mica Olivine Hornblende (amphibole) Potassium feldspar Muscovite mica Quartz 3 Plagioclase feldspar 6

Explanation / Answer

Ans.

1. Olivine - None metallic,pale olive green to yellow colour,concoidal fracture,cleavage absent.

2. Muscovite - Non metallic, colourless to yellow brown colour,silky lusture,1 set cleavage.

3. Quartz - Nonmetallic, colurless to whitegrey colour, glassy lusture.cleavage absent.

4. Biotite - Black to green black colour,cleavage excellent,splits like sheets.

5. Augite - Dark green to black brown colour,2 sets cleavage.

6. Plegeoclase - white grey colour, tabular form, cleavage present.

7. Orthoclase - Brown colour, 2 sets cleavages,translucent prism form,sub parallel Ex solution lamellae.

8. Hornblend - Dark grey to black colour, good cleavage,prismatic.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.