(Lab08)_Carbonates_and_Bicarbonates_F10

(Lab08)_Carbonates_and_Bicarbonates_F10 - Carbonates and...

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1 Carbonates and Bicarbonates GLY 4200 Lab 8 - Fall, 2010
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2 Carbonate Stability Carbonates are minerals consisting of metallic elements bonded to the carbonate group, CO 3 2- Although anionic groups are usually stable, one exception to this is the reaction of a carbonate with acid:
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3 Fizz The carbon dioxide is a gas and bubbles (or "fizzes") off This provides a good qualitative test for the presence of carbonate minerals in most samples Most carbonate minerals will fizz when a small (!) drop of acid is placed on the mineral However, it may be necessary to listen for the fizz and a few minerals react so slowly that the reaction is not detectable
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4 Hydrous Carbonates Hydrous carbonates are often soluble in water Hydrous carbonates are frequently weathering products Some, like azurite and malachite, are indicator minerals for possible ore deposits Both are idiochromatic
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5 Azurite Azurite = Deep blue
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6 Malachite Malachite = green Secondary mineral in the oxidized zones of copper ore deposits This picture shows a botryoidal specimen
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7 Botryoidal From the Greek botrys, meaning bunch or cluster of grapes
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8 Banding in Malachite
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This note was uploaded on 12/13/2010 for the course GLY 4200c taught by Professor Warburton during the Spring '10 term at FAU.

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(Lab08)_Carbonates_and_Bicarbonates_F10 - Carbonates and...

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