Botryogen Mineral Data

General Botryogen Information

Chemical Formula:

MgFe+++(SO4)2(OH)•7(H2O)

Composition:

Molecular Weight = 415.39 gm

Magnesium 5.85 % Mg 9.70 % MgO

Iron 13.44 % Fe 19.22 % Fe₂O₃

Hydrogen 3.64 % H 32.53 % H₂O

Sulfur 15.44 % S 38.55 % SO₃

Oxygen 61.63 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgFe³⁺(SO₄)₂(OH)•7(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1828

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Greek, botrys, meaning "grape' and genos, meaning "to yield."

Name Pronunciation:

Botryogen + Pronunciation

Synonym:

Quetenite

Botryogen Image

Images:

Botryogen

Comments: Bright orange botryogen on white calcite showing it's characteristic botryoidal "grape-like" morphology.
Location: Cerro Pintados, Poza Almonte, Pampa del Tamarugal, Chile. Scale: Picture size 1 cm.
© John Veevaert

Images:

Botryogen

Comments: Reddish to yellowish crystalline botryogen.
Location: Redington Mercury Mine, Knoxville, Napa County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Redingtonite Botryogen

Comments: Pale pink granular redingtonite on yellow-brown botryogen.
Location: Redington Mine, Knoxville, Napa County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Botryogen Crystallography

Axial Ratios:

a:b:c =0.5885:1:0.3991

Cell Dimensions:

a = 10.5, b = 17.84, c = 7.12, Z = 4; beta = 100.25° V = 1,312.43 Den(Calc)= 2.10

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 8.87(1), 2.998(0.8), 6.29(0.6),

Physical Properties of Botryogen

Cleavage:

{010} Perfect, {110} Poor

Color:

Hyacinth red, Ocher yellow.

Density:

2 - 2.1, Average = 2.04

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

2 - Gypsum

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

ochre yellow

Optical Properties of Botryogen

Gladstone-Dale:

CI meas= -0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2584,KPDmeas= 0.2647,KC= 0.2588
Ncalc = 1.52 - 1.54

Optical Data:

Biaxial (+), a=1.522, b=1.529, g=1.577, bire=0.0550, 2V(Calc)=44, 2V(Meas)=41. Dispersion none.

Pleochroism (x):

yellow.

Pleochroism (y):

pale red.

Pleochroism (z):

deep orange red.

Calculated Properties of Botryogen

Electron Density:

Bulk Density (Electron Density)=2.15 gm/cc
note: Specific Gravity of Botryogen =2.10 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Botryogen= 4.98 barns/electron
U=PE_Botryogen x rElectron Density= 10.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Botryogen is Not Radioactive

Botryogen Classification

Dana Class:

31.09.06.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.09)where (A+ B++) (XO4) Zqï¿½x(H2O)

(31.09.06)Botryogen Group

31.09.06.01 Botryogen MgFe(SO4)2(OH)•7(H2O) P 2₁/n 2/m

31.09.06.02 Zincobotryogen (Zn,Mg,Mn)Fe(SO4)2(OH)•7(H2O) P 2₁/n 2/m

31.09.06.03 Xitieshanite Fe(SO4)(Cl)•7(H2O) P 2₁/a 2/m

Strunz Class:

07.DC.25 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DC -With only medium-sized cations; chains of corner-sharing octahedra

07.DC.25 Botryogen MgFe(SO4)2(OH)•7(H2O) P 2₁/n 2/m

07.DC.25 Zincobotryogen (Zn,Mg,Mn)Fe(SO4)2(OH)•7(H2O) P 2₁/n 2/m

Other Botryogen Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Botryogen :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Botryogen

MgFe+++(SO4)2(OH)•7(H2O)
Dana No: 31.09.06.01 Strunz No: 07.DC.25
Locality:

Notes:

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