Mixed volcanic-sedimentary deposits with borate deposits occuring predominantly in the tuffaceous deposits and have thicknesses from 1 to 12 m. Structurally and chemically similar t o colemanite.
IMA Status:
Approved IMA 2006 (Dana # Added)
Locality:
Pobrdjski Potok and Piskanja in the Jarandol lacustrine basin (Miocene), 280 km south from Belgrade, Serbia. Link to MinDat.org Location Data.
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Yamnova N A , Egorov-Tismenko Y K , Malinko S V , Pushcharovskii D Y , Dorokhova G I , Crystallography Reports , 39 (1994) p.991-993, Crystal structure of a new natural calcium hydroborate Ca[B3O4(OH)3], Locality: Belgrade, Serbia, Yugoslavia
Physical Properties of Jarandolite
Cleavage:
{001} Perfect
Color:
Colorless, White.
Diaphaneity:
Transparent to Translucent
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Jarandolite
Gladstone-Dale:
CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2343,KC= 0.2305 Ncalc = 1.59
Optical Data:
Biaxial (+), a=1.573, b=1.586, g=1.626, bire=0.0530, 2V(Calc)=62, 2V(Meas)=60. Dispersion medium, r > v.
Calculated Properties of Jarandolite
Electron Density:
Bulk Density (Electron Density)=2.54 gm/cc note: Specific Gravity of Jarandolite =2.54 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEJarandolite = 2.92 barns/electron U=PEJarandolite x rElectron Density= 7.42 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Jarandolite is Not Radioactive
Jarandolite Classification
Dana Class:
25.03.06.01(25)Anhydrous Borates Containing Hydroxyl or Halogen