Childrenite Mineral Data

Childrenite Mineral Data +

General Childrenite Information

Chemical Formula:

Fe++Al(PO4)(OH)2·(H2O)

Composition:

Molecular Weight = 229.83 gm

Aluminum 11.74 % Al 22.18 % Al₂O₃

Iron 24.30 % Fe 31.26 % FeO

Phosphorus 13.48 % P 30.88 % P₂O₅

Hydrogen 1.75 % H 15.68 % H₂O

Oxygen 48.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Al(PO₄)(OH)₂·(H₂O)

Environment:

Forma a series with eosphorite.

IMA Status:

Valid Species (Pre-IMA) 1823

Locality:

Tavistock, Devonshire, England. Link to MinDat.org Location Data.

Name Origin:

Named for John George Children (1777-1852), English chemist and mineralogist.

Synonym:

ICSD 30686

PDF 47-1859

Childrenite Image

Images:

Childrenite

Comments: Single, terminated crystal of childrenite.
Location: Linopolis, Minas Gerais, Brazil. Scale: 2.6 cm.
© John Veevaert

Images:

Childrenite

Comments: Light-brown, acicular, divergent sprays of childrenite.
Location: Rapid Creek, Yukon, Canada. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Images:

Childrenite

Comments: Columnar, brown, prismatic, crystalline aggregate of childrenite with dark blue lazulite.
Location: Rapid Creek, Yukon Territory, Canada. Scale: See Image.
© Jeff Weissman / Photographic Guide to Mineral Species

Childrenite Crystallography

Axial Ratios:

a:b:c =0.776:1:0.5164

Cell Dimensions:

a = 10.395, b = 13.394, c = 6.918, Z = 8; V = 963.20 Den(Calc)= 3.17

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Bba2

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

By Intensity(I/I_o): 2.81(1), 2.42(0.4), 5.27(0.4),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: [ 1 2 1] [ 1 0 0] [ 1 1 0] [ 1 3 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Giuseppetti G , Tadini C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1984 (1984) p.263-271, The crystal structure of childrenite from Tavistock (SW England),, Ch89Eo11 term of childrenite-eosphorite series, Note: this is the prefered model, Locality: Tavistock, SW England

View Additional jPOWD Structure files for Childrenite
[1]

Physical Properties of Childrenite

Cleavage:

[???] Imperfect

Color:

White, Yellowish brown, Brownish black.

Density:

3.18 - 3.25, Average = 3.21

Diaphaniety:

Translucent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5-5 - Near Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Childrenite

Gladstone-Dale:

CI meas= 0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2127,KPDmeas= 0.2097,KC= 0.2145

Optical Data:

Biaxial (-), a=1.649, b=1.683, g=1.691, bire=0.0420, 2V(Calc)=50, 2V(Meas)=40-45. Dispersion strong, r < v.

Pleochroism (x):

yellow or yellow.

Pleochroism (y):

pink or pink.

Pleochroism (z):

pale pink or colorless.

Calculated Properties of Childrenite

Electron Density:

r_electron=3.14 gm/cc
note: r_Childrenite=3.17 gm/cc.

Fermion Index

Fermion Index = 0.00538
Boson Index = 0.99462

Photoelectric:

PE_Childrenite= 8.15 barns/electron
U=PE_Childrenite x r_electron= 25.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Childrenite is Not Radioactive

Childrenite Classification

Dana Class:

42.7.1.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.1)Dana Group

42.7.1.1 Childrenite FeAl(PO4)(OH)2·(H2O) Bba2 mm2

42.7.1.2 Eosphorite MnAl(PO4)(OH)2·(H2O) Bbam 2/m 2/m 2/m

42.7.1.3 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono

42.7.1.4 Sinkankasite H2MnAl(PO4)2(OH)·6(H2O) P1 1

Strunz Class:

VII/D.14-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.14 - Childrenite - Ernstite series

VII/D.14-10 Childrenite FeAl(PO4)(OH)2·(H2O) Bba2 mm2

VII/D.14-20 Eosphorite MnAl(PO4)(OH)2·(H2O) Bbam 2/m 2/m 2/m

VII/D.14-30 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono

Other Childrenite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

Search for Childrenite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Childrenite :

AA Mineral Specimens

B & L Fine Minerals

Crystal Vaults

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

Rockshop.cz

T G Fine Minerals

Wrights Rock Shop

Translate Childrenite Mineral Data :

Ask about Childrenite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Childrenite Specimen Label here :

Childrenite

Fe++Al(PO4)(OH)2·(H2O)
Dana No: 42.7.1.1 Strunz No: VII/D.14-10
Locality:

Notes: