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Bonaccorsi E , Merlino S , Pasero M , European Journal of Mineralogy , 2 (1990) p.203-218, Rhonite: structural and microstructural features, crystal, chemistry and polysomatic relationships, Locality: volcanic breccias of Scharnhausen
View Additional jPOWD Structure files for Rhonite
[1]
Physical Properties of Rhonite
Cleavage:
{010} Good, {001} Good
Color:
Brown.
Density:
3.4 - 3.76, Average = 3.58
Diaphaneity:
Subtranslucent to Opaque
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Skeletal - Crystals form crude outlines with missing faces.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Sub Metallic
Optical Properties of Rhonite
Gladstone-Dale:
CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2261,KPDmeas= 0.2286,KC= 0.2361 Ncalc = 1.8 - 1.89
Optical Data:
Biaxial (+), a=1.795-1.81, b=1.806-1.825, g=1.83-1.845, bire=0.0350, 2V(Calc)=70-84, 2V(Meas)=50-90. Dispersion r > v extreme.
Pleochroism (x):
dark greenish brown or red brown.
Pleochroism (y):
dark reddish brown or dark greenish brown.
Pleochroism (z):
dark reddish brown or black.
Calculated Properties of Rhonite
Electron Density:
Bulk Density (Electron Density)=3.50 gm/cc note: Specific Gravity of Rhonite =3.58 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PERhonite = 8.09 barns/electron U=PERhonite x relectron= 28.32 barns/cc.
Radioactivity:
GRapi = 6.76 (Gamma Ray American Petroleum Institute Units)
Concentration of Rhonite per GRapi unit = 14.80 (%)
Estimated Radioactivity from Rhonite - barely detectable
Rhonite Classification
Dana Class:
69.02.01a.05(69)Inosilicate Chains with Side Branches or Loops