A rock sample consists of the following minerals by volume: quartz 45 %, feldspar 35 %, mica 15 %, amphibole 5 %. Their respective densities are: quartz 2.65 g cm⁻³, feldspar 2.55 g cm⁻³, mica 2.80 g cm⁻³, amphibole 3.00 g cm⁻³.

(a) Calculate the average density of the rock.
(b) If a specimen of the rock has a volume of 250 cm³, determine its mass.

Question

A rock sample consists of the following minerals by volume: quartz 45 %, feldspar 35 %, mica 15 %, amphibole 5 %. Their respective densities are: quartz 2.65 g cm⁻³, feldspar 2.55 g cm⁻³, mica 2.80 g cm⁻³, amphibole 3.00 g cm⁻³.

(a) Calculate the average density of the rock.
(b) If a specimen of the rock has a volume of 250 cm³, determine its mass.

Accepted Answer

Average density ≈ 2.655 g cm⁻³; mass ≈ 663.75 g

Neco 2018 Geography Question 30

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