General Information:
Chemical Formula:Ca3Si(CO3)(SO4)(OH)6·12(H2O)
Composition:(Molecular Weight = 1,245.24 gm)Calcium 19.31 %
CaSilicon 4.51 %
SiHydrogen 4.86 %
H Carbon 1.93 %
C Sulfur 5.15 %
S Oxygen 64.24 %
O Empirical Formula: Ca6Si2(CO3)2(SO4)2(OH)12·24(H2O)
Locality:Bjelke mine, near Areskutan, Jamtland, Sweden.
Name Origin:From the Greek thaumasion - "surprising."
Physical Properties: Cleavage:[???] Poor
Color:colorless or white.
Density:1.88 - 1.9, Average = 1.89
Diaphaniety:Transparent to translucent
Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Massive - Fibrous - Distinctly fibrous fine-grained forms., Fibrous - Crystals made up of fibe rs.
Hardness:3.5 - Copper Penny
Luminescence:None.
Luster:Vitreous - Silky
Streak:white
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