is a rare calcium manganese magnesium iron carbonate mineral
with formula Ca
. It is a manganese rich analogue of the dolomite
series. It crystallizes in the trigonal
system and occurs as massive to bundled blades of white through rose pink to light brown crystal forms. The pink shades are due to increased manganese where as the brown colors are due to increased iron content. It shows the perfect three directions of cleavage typical of carbonates. It has a Mohs hardness
of 3.5 to 4 and a specific gravity
of 3.1 - 3.12. It is translucent to transparent with refractive index
values of nω = 1.727 and nε = 1.535.
It was first described in 1901 and named for its type locality of Kutna Hora, Bohemia, Czech Republic.