In lazulite-quartz veins in phyllite-micaschist. The scandium dominant analog of xenotime-(Y).
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
The type locality is 100 m southwest of Hollkegel, which is 12 km south-southwest of Murzzuschlag, Fischbacher Alpen, Styria, Austria. Link to MinDat.org Location Data.
Name Origin:
For the mountain Pretul, one of the localities at which the mineral occurs.
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Physical Properties of Pretulite
Cleavage:
{100} Perfect
Color:
Pale pink.
Density:
3.71
Diaphaneity:
Transparent
Fracture:
Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Hardness:
5 - Apatite
Luster:
Adamantine
Streak:
white
Optical Properties of Pretulite
Gladstone-Dale:
CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2126,KPDmeas= 0.2115,KC= 0.2195 Ncalc = 1.81
Optical Data:
Uniaxial (+), w=1.709, e=1.86, bire=0.1510.
Calculated Properties of Pretulite
Electron Density:
Bulk Density (Electron Density)=3.59 gm/cc note: Specific Gravity of Pretulite =3.69 gm/cc.
Fermion Index:
Fermion Index = 0.0002195344 Boson Index = 0.9997804656
Photoelectric:
PEPretulite = 5.60 barns/electron U=PEPretulite x rElectron Density= 20.07 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pretulite is Not Radioactive
Chemical Formula: 
