Hydroxyapophyllite Mineral Data

Hydroxyapophyllite Mineral Data

[Register] [Auction Rules] [Current Listing] [About Us] [Site Map]
e-Rocks.com, auction and sales venue for all rock and mineral enthusiasts
Our mission is to provide an online centre for Buyers and Sellers with reliable service and support
Brought to you by Thames Valley Minerals

General Hydroxyapophyllite Information

Chemical Formula:

KCa4Si8O20(OH,F)·8(H2O)

Composition:

Molecular Weight = 759.07 gm

Potassium 4.38 % K 5.27 % K₂O

Sodium 0.45 % Na 0.61 % Na₂O

Calcium 21.12 % Ca 29.55 % CaO

Silicon 29.60 % Si 63.32 % SiO₂

Hydrogen 0.11 % H 0.95 % H₂O

Oxygen 43.84 % O

Fluorine 0.50 % F 0.50 % F

- % F -0.21 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_0.85Na_0.15Ca₄Si₈O₂₀(OH)_0.8F_0.2

IMA Status:

Approved IMA 1978

Locality:

Ore Knob mine, Jefferson, Ashe County, North Carolina, USA Link to MinDat.org Location Data.

Name Origin:

From the Greek apophylliso - "it flakes off" and the predominant hydroxyl anion.

Synonym:

Apophyllite

ICSD 200329

PDF 29-994

Hydroxyapophyllite Image

Images:

Click Here for Larger Hydroxyapophyllite Image

Hydroxyapophyllite Apophyllite Stilbite

Comments: 3 cm. pink-colored rosette of stilbite and clear "apophyllite" (probably hydroxyapophyllite) in an amygdaloidal cavity.
Location: Aurangabad District, Jalgaon, India. Scale: Specimen size 6 cm.
© Dave Barthelmy

Images:

Hydroxyapophyllite Apophyllite

Comments: Crystal cluster of tabular hydroxyapophyllite.
Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 2.5 x 2.3 cm.
© John Veevaert

Hydroxyapophyllite Crystallography

Axial Ratios:

a:c = 1:1.76319

Cell Dimensions:

a = 8.978, c = 15.83, Z = 2; V = 1,275.97 Den(Calc)= 1.98

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnc

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

By Intensity(I/I_o): 3.965(1), 2.99(0.67), 1.588(0.26),

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

Rouse R C , Peacor D R , Dunn P J , American Mineralogist , 63 (1978) p.196-202, Hydroxyapophyllite, a new mineral, and a redefinition of the apophyllite group, II. Crystal structure, Note: sample is from Kimberley, South Africa

Physical Properties of Hydroxyapophyllite

Cleavage:

[001] Perfect

Color:

White, Pink, Green, Yellow, Violet.

Density:

2.3 - 2.4, Average = 2.34

Diaphaniety:

Transparent

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Hydroxyapophyllite

Gladstone-Dale:

CI meas= -0.106 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.313 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.274,KPDmeas= 0.2309,KC= 0.2087

Optical Data:

Uniaxial (+), w=1.542, e=1.543, bire=0.0010.

Calculated Properties of Hydroxyapophyllite

Electron Density:

r_electron=2.35 gm/cc
note: r_{Hydroxyapophyllite}=2.35 gm/cc.

Fermion Index

Fermion Index = 0.01432
Boson Index = 0.98568

Photoelectric:

PE_{Hydroxyapophyllite}= 4.17 barns/electron
U=PE_{Hydroxyapophyllite} x r_electron= 9.78 barns/cc.

Radioactivity:

GRapi = 63.07 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Hydroxyapophyllite - barely detectable

Hydroxyapophyllite Classification

Dana Class:

72.3.1.2 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.3)with 3-, 4-, or 5-membered rings and 8-membered rings

(72.3.1)Apophyllite group (4- & 8-membered rings)

72.3.1.0 Apophyllite* KCa4(Si4O10)2F·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.1 Fluorapophyllite (K,Na)Ca4Si8O20(F,OH)·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.2 Hydroxyapophyllite KCa4Si8O20(OH,F)·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.3 Natroapophyllite NaCa4Si8O20F·8(H2O) Pnnm 2/m 2/m 2/m

72.3.1.4 Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O) P 4/mbm 4/m 2/m 2/m

Strunz Class:

VIII/H.01-30 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.01 - Apophyllite series

VIII/H.01-10 Natroapophyllite NaCa4Si8O20F·8(H2O) Pnnm 2/m 2/m 2/m

VIII/H.01-20 Fluorapophyllite (K,Na)Ca4Si8O20(F,OH)·8(H2O) P 4/mnc 4/m 2/m 2/m

VIII/H.01-30 Hydroxyapophyllite KCa4Si8O20(OH,F)·8(H2O) P 4/mnc 4/m 2/m 2/m

Other Hydroxyapophyllite Information

References:

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

Search for Hydroxyapophyllite using:

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

Visit our Advertisers for Hydroxyapophyllite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Hydroxyapophyllite Mineral Data :

Ask about Hydroxyapophyllite 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 Hydroxyapophyllite Specimen Label here :

Hydroxyapophyllite

KCa4Si8O20(OH,F)·8(H2O)
Dana No: 72.3.1.2 Strunz No: VIII/H.01-30
Locality:

Notes: