True granite is mostly Silicon Dioxide (quartz) while marbles are mostly Calcium Carbonate (lime).
Hard water minerals are similar to what make up marbles and many magnesium/calcium carbonate-based rock minerals.
Vinegar and commercial lime/calcium/rust cleaners like CLP and Lime-Away are safe to use for granite since they don't react with quartz.
You can also use mechanical means like fine sandpaper, Scotch-Brite or wire brush to clean granite if you don't want to use chemicals.
From: Lori Granger <redteam@frostyscorner.com>
To: "DoIt_Yourself@yahoogroups.com" <DoIt_Yourself@yahoogroups.com>
Sent: Friday, March 29, 2013 5:09 AM
Subject: [DIY] Hard Water Minerals on Granite
Hard water minerals are similar to what make up marbles and many magnesium/calcium carbonate-based rock minerals.
Vinegar and commercial lime/calcium/rust cleaners like CLP and Lime-Away are safe to use for granite since they don't react with quartz.
You can also use mechanical means like fine sandpaper, Scotch-Brite or wire brush to clean granite if you don't want to use chemicals.
From: Lori Granger <redteam@frostyscorner.com>
To: "DoIt_Yourself@yahoogroups.com" <DoIt_Yourself@yahoogroups.com>
Sent: Friday, March 29, 2013 5:09 AM
Subject: [DIY] Hard Water Minerals on Granite
I recently moved the coffee maker on the counter and found very thick, what appear to be hardwater deposits on my black granite countertop. Does anyone know what fluids are safe to try to remove them?. I know you shouldn't use vinegar on marble, for example, but not sure about granite!
Lori
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