Product of supergene alteration (oxidation and dehydration) of a Fe2+-rich protophase locally known as "amorphous greenish grey mineral". Related to nafertisite.
IMA Status:
Approved IMA 2005 (Dana # Added)
Locality:
Umbozero mine, Alluaiv, Lovozero, Kola Peninsula, Russia Link to MinDat.org Location Data.
Name Origin:
The name is taken from the Greek for (nut) and (color) which recalls its hazel-brown color.
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Pseudomorphous - Occurs in the form of another mineral.
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
2.5 - Finger Nail
Luster:
Waxy
Streak:
pale brownish yellow
Optical Properties of Caryochroite
Gladstone-Dale:
CI meas= 0.071 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2403,KPDmeas= 0.2475,KC= 0.2663 Ncalc = 1.8 - 1.82
Optical Data:
Biaxial (-), a=1.7, b=1.745, g=1.775, bire=0.0750
Calculated Properties of Caryochroite
Electron Density:
Bulk Density (Electron Density)=2.94 gm/cc note: Specific Gravity of Caryochroite =2.99 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PECaryochroite = 12.33 barns/electron U=PECaryochroite x relectron= 36.22 barns/cc.
Radioactivity:
GRapi = 7.30 (Gamma Ray American Petroleum Institute Units)
Concentration of Caryochroite per GRapi unit = 13.70 (%)
Estimated Radioactivity from Caryochroite - barely detectable
Caryochroite Classification
Dana Class:
56.02.06b.06(56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
(56.02)with cations in [4] and/or >[4] coordination
(56.02.06b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)
56.02.06b.01 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m
56.02.06b.02 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 21/m 2/m
Chemical Formula: 
- barely detectable