Picromerite Mineral Data

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

General Picromerite Information

Chemical Formula:

K2Mg(SO4)2•6(H2O)

Composition:

Molecular Weight = 402.72 gm

Potassium 19.42 % K 23.39 % K₂O

Magnesium 6.04 % Mg 10.01 % MgO

Hydrogen 3.00 % H 26.84 % H₂O

Sulfur 15.92 % S 39.76 % SO₃

Oxygen 55.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Mg(SO₄)₂•6(H₂O)

Environment:

Volcanic fumaroles and marine evaporite deposits.

IMA Status:

Valid Species (Pre-IMA) 1855

Locality:

Vesuvius, Italy Link to MinDat.org Location Data.

Name Origin:

From the Greek for "bitter" and "part" in allusion to the magnesium content which makes this water-soluble salt bitter to the taste.

Name Pronunciation:

Picromerite + Pronunciation

Synonym:

ICSD 26772

PDF 21-1400

Schoenite

Picromerite Image

Images:

Picromerite

Comments: Blocky white picromerite crystals on reddish halite.
Location: Heringen, Werra Valley, North Hesse, Hesse, Germany. Scale: Specimen Size 5.5 x 4.7 x 3.4 cm.
© Rob Lavinsky

Picromerite Crystallography

Axial Ratios:

a:b:c =0.7395:1:0.4987

Cell Dimensions:

a = 9.064, b = 12.256, c = 6.113, Z = 2; beta = 104.8° V = 656.55 Den(Calc)= 2.04

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): 3.706(1), 4.064(0.95), 4.156(0.85),

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: ( 0 1 1) ( 1 1 1) ( 0 1 0) ( 2 0 1) ( 1 1 0) ( 1 0 0) ( 0 0 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

Kannan K K , Viswamitra M A , Zeitschrift fur Kristallographie , 122 (1965) p.161-174, Crystal structure of magnesium potassium sulfate hexahydrate MgK2(SO4)2*6(H2O), Locality: synthetic

Physical Properties of Picromerite

Cleavage:

{201} Perfect

Color:

Colorless, Gray, Yellow, White, Reddish.

Density:

2.028

Diaphaneity:

Transparent

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Picromerite

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2286,KPDmeas= 0.23,KC= 0.2275
Ncalc = 1.46

Optical Data:

Biaxial (+), a=1.4607, b=1.4629, g=1.4755, bire=0.0148, 2V(Calc)=46, 2V(Meas)=47.9.

Calculated Properties of Picromerite

Electron Density:

Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Picromerite =2.04 gm/cc.

Fermion Index:

Fermion Index = 0.0075243351
Boson Index = 0.9924756649

Photoelectric:

PE_Picromerite= 3.04 barns/electron
U=PE_Picromerite x r_electron= 6.35 barns/cc.

Radioactivity:

GRapi = 286.60 (Gamma Ray American Petroleum Institute Units)
Concentration of Picromerite per GRapi unit = 0.35 (%)

Estimated Radioactivity from Picromerite - barely detectable

Picromerite Classification

Dana Class:

29.03.06.01 (29)Hydrated Acid and Sulfates

(29.03)where (A+)2 B (XO4)2 · x(H2O)

(29.03.06)Dana Group

29.03.06.01 Picromerite K2Mg(SO4)2•6(H2O) P 2₁/a 2/m

29.03.06.02 Cyanochroite K2Cu(SO4)2•6(H2O) P 2₁/a 2/m

Strunz Class:

07.CC.60 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CC -With medium-sized and large cations

07.CC.60 Boussingaultite (NH4)2Mg(SO4)2•6(H2O) P 2₁/a 2/m

07.CC.60 Cyanochroite K2Cu(SO4)2•6(H2O) P 2₁/a 2/m

07.CC.60 Mohrite (NH4)2Fe(SO4)2•6(H2O) P 2₁/c 2/m

07.CC.60 Picromerite K2Mg(SO4)2•6(H2O) P 2₁/a 2/m

07.CC.60 Nickelboussingaultite (NH4)2(Ni,Mg)(SO4)2•6(H2O) P 2₁/a 2/m

Other Picromerite Information

References:

NAME( Dana7) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Picromerite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - MinMax(Deutsch)
12 - MinMax(English)
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info

Search for Picromerite using:

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

Visit our Advertisers for Picromerite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Picromerite Mineral Data :

Ask about Picromerite 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 Picromerite Specimen Label here :

Picromerite

K2Mg(SO4)2•6(H2O)
Dana No: 29.03.06.01 Strunz No: 07.CC.60
Locality:

Notes: