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Robert J L , Gasperin M , Tschermaks Mineralogische und Petrographische Mitteilungen , 34 (1985) p.1-14, Crystal structure refinement of hendricksite, a Zn- and Mn-rich trioctahedral, potassium mica: a contribution to the crystal chemistry of zinc-bearing minerals, Locality: Franklin Furnace, New Jersey, USA, Note: polytype 1M
Physical Properties of Hendricksite
Cleavage:
{001} Perfect
Color:
Copper brown, Red, Reddish black.
Density:
2.86 - 3.43, Average = 3.14
Diaphaneity:
Translucent
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Foliated - Two dimensional platy forms.
Hardness:
2.5-3 - Finger Nail-Calcite
Streak:
red brown
Optical Properties of Hendricksite
Gladstone-Dale:
CI meas= -0.063 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= -0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2043,KPDmeas= 0.2079,KC= 0.1957 Ncalc = 1.56 - 1.67
Optical Data:
Biaxial (-), a=1.598-1.624, b=1.658-1.686, g=1.66-1.697, bire=0.0620-0.0730, 2V(Calc)=20-44, 2V(Meas)=2-5. Dispersion r < v slight.
Pleochroism (x):
pale yellow.
Pleochroism (y):
light chestnut brown.
Pleochroism (z):
light chestnut brown.
Calculated Properties of Hendricksite
Electron Density:
Bulk Density (Electron Density)=3.12 gm/cc note: Specific Gravity of Hendricksite =3.20 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEHendricksite = 13.25 barns/electron U=PEHendricksite x relectron= 41.31 barns/cc.
Radioactivity:
GRapi = 100.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Hendricksite per GRapi unit = 1.00 (%)
Estimated Radioactivity from Hendricksite - barely detectable
Hendricksite Classification
Dana Class:
71.02.02b.06(71)Phyllosilicate Sheets of Six-Membered Rings