Herderite Mineral Data

Herderite Mineral Data +

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General Herderite Information

Chemical Formula:

CaBe(PO4)F

Composition:

Molecular Weight = 163.06 gm

Calcium 24.58 % Ca 34.39 % CaO

Beryllium 5.53 % Be 15.34 % BeO

Phosphorus 19.00 % P 43.53 % P₂O₅

Oxygen 39.25 % O

Fluorine 11.65 % F 11.65 % F

- % F -4.91 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaBe(PO₄)F

Environment:

Forms a series with hydroxylherderite.

IMA Status:

Valid Species (Pre-IMA) 1828

Locality:

Ehrenfriedersdorf, Saxony, Germay. Link to MinDat.org Location Data.

Name Origin:

Named for Siegmund August Wolfgang von Herder (1776-1838), mining official in Freiberg, Saxony, Germany.

Synonym:

ICSD 20573

PDF 6-338

Herderite Image

Images:

Herderite

Comments: Partially transparent herderite crystal with minor white albite.
Location: Alto do Corrego Frio, Linopolis, Minas Gerais, Brazil. Scale: 3.1x2.7x2.9 cm.
© Fabre Minerals

Herderite Crystallography

Axial Ratios:

a:b:c =1.2777:1:0.627

Cell Dimensions:

a = 9.789, b = 7.661, c = 4.804, Z = 4; beta = 90.02° V = 360.27 Den(Calc)= 3.01

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.14(1), 2.86(0.8), 2.2(0.7),

Forms:

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Forms: [ 1 1 0] [ 1 1 1] [ 0 1 1]

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Physical Properties of Herderite

Cleavage:

[110] Indistinct

Color:

White, Yellowish white, Greenish white.

Density:

Diaphaniety:

Transparent to Translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Herderite

Gladstone-Dale:

CI meas= -0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2019,KPDmeas= 0.2026,KC= 0.1942

Optical Data:

Biaxial (-), a=1.591-1.592, b=1.611-1.612, g=1.619-1.621, bire=0.0280-0.0290

Calculated Properties of Herderite

Electron Density:

r_electron=2.95 gm/cc
note: r_Herderite=3.01 gm/cc.

Fermion Index

Fermion Index = 0.05578
Boson Index = 0.94422

Photoelectric:

PE_Herderite= 4.08 barns/electron
U=PE_Herderite x r_electron= 12.04 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Herderite is Not Radioactive

Herderite Classification

Dana Class:

41.5.4.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.4)Dana Group

41.5.4.1 Herderite CaBe(PO4)F P 2₁/a 2/m

41.5.4.2 Hydroxylherderite CaBe(PO4)(OH) P 2₁/a 2/m

41.5.4.3 Vayrynenite MnBe(PO4)(OH,F) P 2₁/a 2/m

41.5.4.4 Bergslagite CaBe(AsO4)(OH) P 2₁/c 2/m

Strunz Class:

VII/B.01-10 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH, cations of very small size: Li, Be

VII/B.01 - Herderite - Babefphite series

VII/B.01-10 Herderite CaBe(PO4)F P 2₁/a 2/m

VII/B.01-20 Hydroxylherderite CaBe(PO4)(OH) P 2₁/a 2/m

VII/B.01-30 Bergslagite CaBe(AsO4)(OH) P 2₁/c 2/m

VII/B.01-50 Vayrynenite MnBe(PO4)(OH,F) P 2₁/a 2/m

VII/B.01-60 Babefphite BaBe(PO4)(F,O) I 4₁/amd 4/m 2/m 2/m

Other Herderite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Herderite

CaBe(PO4)F
Dana No: 41.5.4.1 Strunz No: VII/B.01-10
Locality:

Notes: