the bedrock
dolostone
limestone with magnesium · slow to fizz
The tell
Looks exactly like limestone, and the difference is in the fizz. Vinegar on limestone bubbles right away; on dolostone it barely stirs unless you scratch the spot to powder first. Slow to fizz is the whole tell.
This is the bedrock up north: Door, the Straits, Drummond, the Bruce. On the Bruce Peninsula the shore is a national park, so look all you want and take nothing.
What it gets mistaken for
- limestone
- banded chert
- marble
- pale sandstone
The facts
- also calledslow to fizz · the dolomites are named for it
- age~430 million yrs
- classsedimentary
- where it turns upDoor, the Straits, Drummond · not Bruce NP
- the field markonly fizzes where you scratch powder off it
- on the chartthe bedrock · 1000 stickers ever
Put it on the shelf
Every stone on this chart is drawn and kiss-cut at three inches. The rarer the stone, the fewer exist: only 1000 dolostone will ever be printed, then the run is retired.
10% of every order goes to northern Michigan animal shelters.