General Information:
Chemical Formula:(Ba,Na,K)1-2(Si,Al)8O16·6(H2O)
Composition:(Molecular Weight = 723.89 gm)Barium 18.97 %
BaAluminum 7.45 %
AlSilicon 23.28 %
SiHydrogen 1.67 %
H Oxygen 48.62 %
O Empirical Formula: BaAl2Si6O16·6(H2O)
Environment:Alteration product of basalt and similar eurptive rocks.
IMA Status:Approved IMA
Locality:Bodenmais in Bavaria, Germany.
Name Origin:From the Greek harmos - "I combine" and temseis - "I cut" alluding to the fact that the pyramid divides parallel to the plane that passes through the terminal edges.
Physical Properties: Cleavage:[010] Good, [001] Fair
Color:white, gray, yellow, red, or brown.
Density:2.44 - 2.5, Average = 2.46
Diaphaniety:Subtransparent to translucent
Habits:Twinning Common - Crystals are usually twinned., Cruciform - Twinned tabular crystals with a cross-like outline., Striated - Parallel lines on crystal surface or cleavage face.
Hardness:4-5 - Fluorite-Apatite
Luminescence:Fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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