Halides and Sulfates

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10 Terms

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Halide Bonding

Ionic

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Common Halide Anion

Cl-, F-, Br-, I-

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Common Characteristics of Halides

Low Hardness

Easily dissolve in water

High symmetry

Mod-High Melting Points

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Formation of Halides

Evaporation of Seawater

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Halide Formation Order

Gypsum/Anhydrite > Halide > Rare Sulfates/Chlorides of Mg2+ and K+

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Rock Record of Halides

They weather VERY easily

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Anhydrite vs Gypsum

Anhydrite is dehydrated gypsum.

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Three varieties of gypsum

Satin Spar (Fibrous)

Alabaster (Massive)
Selenite (Transparent)

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Common Properties of Halite, Fluorite and Sylvite

Cubic crystal habit

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Sulfates Anion Grouping

(SO4)2-