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Grey I E , Gatehouse B M , The Canadian Mineralogist , 16 (1978) p.63-68, The crystal structure of landauite, Na[MnZn2(Ti,Fe)6Ti12]O38
Physical Properties of Landauite
Cleavage:
None
Color:
Black.
Density:
4.42
Diaphaneity:
Subtranslucent to Opaque
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
7.5 - Garnet
Luster:
Sub Metallic
Streak:
gray
Optical Properties of Landauite
Dichroism (e):
bottle green.
Dichroism (w):
green.
Gladstone-Dale:
CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.064 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3095,KPDmeas= 0.3123,KC= 0.3308 Ncalc = 2.46 - 2.48
Optical Data:
Uniaxial (-), e=2.373, w=2.388, bire=0.0150.
Calculated Properties of Landauite
Electron Density:
Bulk Density (Electron Density)=4.18 gm/cc note: Specific Gravity of Landauite =4.42 gm/cc.
Fermion Index:
Fermion Index = 0.06 Boson Index = 0.94
Photoelectric:
PELandauite = 53.26 barns/electron U=PELandauite x relectron= 222.55 barns/cc.
Radioactivity:
GRapi = 6.17 (Gamma Ray American Petroleum Institute Units)
Concentration of Landauite per GRapi unit = 16.22 (%)
Estimated Radioactivity from Landauite - barely detectable
Landauite Classification
Dana Class:
08.05.01.01(08)Multiple Oxides with Nb, Ta, and Ti