Chalk (Limestone Rock)

SasquatchTortoise

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I was scrolling through the forum when I saw a few people mention something about giving or letting tortoises chew on chalk or high-calcium limestone for supplementation. Rock Chalk (not sidewalk chalk or climbing chalk, which sometimes has lead), as far as I am aware, is almost completely composed of Calcium Carbonate.
Wikipedia:
"Chalk is typically almost pure calcite, CaCO3, with just 2% to 4% of other minerals. These are usually quartz and clay minerals, though collophane (cryptocrystalline apatite, a phosphate mineral) is also sometimes present, as nodules or as small pellets interpreted as fecal pellets. In some chalk beds, the calcite has been converted to dolomite, CaMg(CO3)2, and in a few cases the dolomitized chalk has been dedolomitized back to calcite.[3]"

Any thoughts about this?
 

Mr. RussianTortoise

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Oct 5, 2023
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NJ
I was scrolling through the forum when I saw a few people mention something about giving or letting tortoises chew on chalk or high-calcium limestone for supplementation. Rock Chalk (not sidewalk chalk or climbing chalk, which sometimes has lead), as far as I am aware, is almost completely composed of Calcium Carbonate.
Wikipedia:
"Chalk is typically almost pure calcite, CaCO3, with just 2% to 4% of other minerals. These are usually quartz and clay minerals, though collophane (cryptocrystalline apatite, a phosphate mineral) is also sometimes present, as nodules or as small pellets interpreted as fecal pellets. In some chalk beds, the calcite has been converted to dolomite, CaMg(CO3)2, and in a few cases the dolomitized chalk has been dedolomitized back to calcite.[3]"

Any thoughts about this?
I'm no expert but are you talking about cuttlebones? Correct me if I'm wrong.
 

SasquatchTortoise

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Joined
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Messages
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Location (City and/or State)
Forth Worth, Texas
I'm no expert but are you talking about cuttlebones? Correct me if I'm wrong.
Well, chalk is technically the remains of very old sea creatures... I was mainly talking about the stuff that can be mined out of the ground.
that's partly why I was curious- Both are made of the same material (CaCO3), However Chalk is made of a form called calcite, and cuttlebone is formed as aragonite- a different molecular organization, if Google is to be believed.
 

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