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Mcguinnessite Mineral Data

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General Mcguinnessite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Cu)2(CO3)(OH)2
Help on Composition: Composition: Molecular Weight = 162.25 gm
   Magnesium  22.47 %  Mg   37.26 % MgO
   Copper     19.58 %  Cu   24.51 % CuO
   Hydrogen    1.24 %  H    11.10 % H2O
   Carbon      7.40 %  C    27.12 % CO2
   Oxygen     49.30 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg1.5Cu0.5(CO3)(OH)2
Help on Environment: Environment: Occurs in serpentinized peridotite.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Miners Ridge, Red Mountain, 15 miles SE of Ukiah, Mendocino County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Albert L. McGuinness (1926-1990), mineral dealer, San Mateo, California, USA>
Help on Name Pronunciation: Name Pronunciation: Mcguinnessite + Pronunciation Say MCGUINNESSITE

Mcguinnessite Image

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Comments: Cotton ball clusters of vivid blue mcguinnessite crystals on matrix.
Location: Miners Ridge, Red Mountain, Mendocino County, California, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Vuagnatite   Mcguinnessite

Comments: Translucent colorless vuagnatite microcrystals with mcguinnessite.
Location: Near Red Mountain, Mendocino County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mcguinnessite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7824:1:0.2813
Help on Cell Dimensions: Cell Dimensions: a = 9.398, b = 12.011, c = 3.379, Z = 4; beta = 93.28° V = 380.79 Den(Calc)= 2.83
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a or P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.015(1), 3.694(0.67), 2.14(0.3),2.53(0.25), 2.33(0.2), 5.05(0.2), 3(0.1), 7.4(0.1),

Physical Properties of Mcguinnessite

Help on Color: Color: Blue green, Green, White.
Help on Density: Density: 3.02 - 3.22, Average = 3.12
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Silky

Optical Properties of Mcguinnessite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.039 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.146 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2419,KPDmeas= 0.2194,KC= 0.2112
Ncalc = 1.6 - 1.68
Help on Optical Data: Optical Data: Biaxial (-), a=1.596-1.602, b=1.724-1.73, g=1.724-1.732, bire=0.1280-0.1300
Help on Pleochroism (x): Pleochroism (x): very pale green.
Help on Pleochroism (y): Pleochroism (y): light blue green.
Help on Pleochroism (z): Pleochroism (z): light blue green.

Calculated Properties of Mcguinnessite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Mcguinnessite =3.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEMcguinnessite = 8.94 barns/electron
U=PEMcguinnessite x rElectron Density= 27.69 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mcguinnessite is Not Radioactive

Mcguinnessite Classification

Help on  Dana Class: Dana Class: 16a.03.01.05 (16a)Carbonates - Hydroxyl or Halogen
  (16a.03)where (A B)2 (XO3) Zq
  (16a.03.01)Rosasite Group
16a.03.01.01 Rosasite (Cu,Zn)2(CO3)(OH)2 P 21/a 2/m
16a.03.01.02 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 21/a 2/m
16a.03.01.03 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri
16a.03.01.04 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 21/a 2/m
16a.03.01.05 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 21/a 2/m
Help on  Strunz Class: Strunz Class: 05.BA.10 05 - CARBONATES (NITRATES)
  05.B - Carbonates with additional anions, without H2O
  05.BA -With Cu, Co, Ni, Zn, Mg, Mn
05.BA.10 Nullaginite Ni2(CO3)(OH)2 P 21/m,P 21 Mono
05.BA.10 Georgeite Cu5(CO3)3(OH)4•6(H2O) None
05.BA.10 Malachite Cu2(CO3)(OH)2 P 21/a 2/m
05.BA.10 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 21/a 2/m
05.BA.10 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 21/a 2/m
05.BA.10 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri
05.BA.10 Pokrovskite Mg2(CO3)(OH)2•0.5(H2O) P 21/a 2/m
05.BA.10 Rosasite (Cu,Zn)2(CO3)(OH)2 P 21/a 2/m
05.BA.10 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 21/a 2/m
05.BA.10 Chukanovite! Fe2(CO3)(OH)2 P 21/a 2/m

Other Mcguinnessite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Mcguinnessite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: 16a.03.01.05 Strunz No: 05.BA.10





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