Vogt (1911) describes bertrandite from Tveit. Bjørlykke (1937) says that the locality is probably Tveit 3
Habit:
Small crystals in dark masses of pseudmorphs after beryl
Colour:
white translucent
Quality of samples:
not specified / average specimens
Confirmation
Validity:
Believed Valid
References
References:
Bjørlykke, H.( 1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311