Sulfates, Tungstates, and Phosphates

Question 1

Anglesite

Answer 1

PbSO₄

• dense and heavy
• white streak

Question 2

Anhydrite

Answer 2

CaSO₄

• rectangular cleavage fragments
• soft feel to it

Question 3

Barite

Answer 3

BaSO₄

• orthorhombic crystals
• high density for a light coloured minerals

Question 4

Celestite

Answer 4

SrSO₄

• light blue colour which tints only part of a white or colourless crystal
• hardness is 3, penny shouls scratch it

Question 5

Gypsum

Answer 5

CaSO₄·2H₂O

• very soft, fingernail can scratch it
• flat crystals

Question 6

Scheelite

Answer 6

CaWO₄

• white streak
• tetragonal crystals

Question 7

Apatite

Answer 7

Ca₅(PO₄)₃F

• greasy luster
• tabular structure, hexagonal