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Mcguinnessite

Big Photo

Copper King Mine, Red Mountain District, Mendocino Co., California, USA
© Don Volkman 02/06

Show Mcguinnessite Photos (17)
Formula:
(Mg,Cu)
 
2
[(OH)
 
2
|CO
 
3
]
Hardness:2½


Rosasite Group.

Classification of Mcguinnessite

IMA status:Approved
Strunz 8th edition ID:5/C.01-40
Nickel-Strunz 10th (pending) edition ID:5.BA.10

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
Dana 8th edition ID:16a.3.1.4

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
Hey's CIM Ref.:11.3.11

11 : Carbonates
3 : Carbonates of Mg
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Type Occurrence of Mcguinnessite

Type Locality:Copper King Mine, Red Mountain District, Mendocino Co., California, USA

Physical Properties of Mcguinnessite

Hardness (Mohs):2½

Optical Data of Mcguinnessite

Type:Biaxial (-)
RI values: nα = 1.596 - 1.602 nβ = 1.724 - 1.730 nγ = 1.724 - 1.732
Maximum Birefringence:δ = 0.128 - 0.130

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r < v weak

Chemical Properties of Mcguinnessite

Formula:
(Mg,Cu)
 
2
[(OH)
 
2
|CO
 
3
]
Essential elements:C, H, Mg, O
All elements listed in formula:C, Cu, H, Mg, O

Relationship of Mcguinnessite to other Species

Related Minerals - Nickel-Strunz Grouping):
5.BA.05Azurite
Cu
 
3
[OH|CO
 
3
]
 
2
5.BA.10Georgeite
Cu
 
2
[(OH)
 
2
|CO
 
3
] · 6H
 
2
O
5.BA.10Glaukosphaerite
(Cu,Ni)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Kolwezite
(Cu,Co)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Malachite
Cu
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Nullaginite
Ni
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Pokrovskite
Mg
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Rosasite
(Cu,Zn)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Zincrosasite
(Zn,Cu)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Chukanovite
Fe
2+
2
[(OH)
 
2
|CO
 
3
]
5.BA.15Aurichalcite
(Zn,Cu)
 
5
[(OH)
 
3
|CO
 
3
]
 
2
5.BA.15Hydrozincite
Zn
 
5
[(OH)
 
3
|CO
 
3
]
 
2
5.BA.20Holdawayite
Mn
 
6
(CO
 
3
)
 
2
(OH)
 
7
(Cl,OH)
5.BA.25Defernite
Ca
 
6
(CO
 
3
)
 
2-x
(SiO
 
4
)
 
x
(OH)
 
7
(Cl,OH)
 
1-2x
 (x=0.5)
5.BA.30Loseyite
(Zn,Mn
2+
 
)
 
7
[(OH)
 
5
|CO
 
3
]
 
2
5.BA.30Sclarite
(Zn,Mg,Mn
2+
 
)
 
4
Zn
 
3
[(OH)
 
5
|CO
 
3
]
 
2
Related Minerals - Hey's Index Grouping:
11.3.1Magnesite
MgCO
 
3
11.3.2Barringtonite
MgCO
 
3
·2H
 
2
O
11.3.3Nesquehonite
MgCO
 
3
·3H
 
2
O
11.3.4Lansfordite
MgCO
 
3
·5H
 
2
O
11.3.5Pokrovskite
Mg
 
2
[(OH)
 
2
|CO
 
3
]
11.3.6Artinite
Mg
 
2
[(OH)
 
2
|CO
 
3
] · 3H
 
2
O
11.3.7Hydromagnesite
Mg
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 4H
 
2
O
11.3.8Giorgiosite
Mg
 
5
[(CO
 
3
)
 
4
(OH)
 
2
] · 4H
 
2
O
11.3.9Dypingite
Mg
 
5
[OH|(CO
 
3
)
 
2
]
 
2
 · 5H
 
2
O
11.3.10Eitelite
Na
 
2
Mg(CO
 
3
)
 
2

Other Names for Mcguinnessite

Synonyms:
IMA1977-027
German names:
McGuinnessit
Spanish names:
McGuinnessita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mcguinnessite

Reference List:American Mineralogist (1981): 66: 1276.

Erd, R. C., Cesbron, F. P., Goff, F. E. & Clark, J. R. (1981): Mcguinnessite, a new carbonate from California: Mineralogical Record: 12: 143-147.

Internet Links for Mcguinnessite

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    Localities for Mcguinnessite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • South Australia
      • Yorke Peninsula
        • Moonta
    		XRD confirmed by South Australian Museum
    Austria
     
    • Styria
      • Leoben
        • Kraubath
    		R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
          • St Stefan
    		R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    Italy
     
    • Liguria
      • Genova Province
        • Genova
          • Borzoli
    		M.E. Ciriotti, 2006
    Japan
     
    • Honshu Island
      • Chubu Region
        • Aichi prefecture
          • Shinshiro city
    		Matsubara & Kato (1993) Ganseki-Koubutsu-Koshogaku Zasshi, 88, 517-524.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tazenakht
          • Bou Azzer District
            • Aghbar
    		Anthony, Bideaux, Bladh, Nichols: Handbook of Mineralogy, Vol. IV
    USA
     
    • California
      • Mendocino Co.
        • Red Mountain District
    		Min.Rec.(1981) 12, 143-147
    • Maryland
      • Montgomery Co.
        • Rockville
    		Min Rec 36:4 pp 435-446
    • Nevada
      • Churchill Co.
        • Chalk Mountain District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
    NBMG Spec. Pub. 31 Minerals of Nevada
        • Westgate District
    		NBMG Spec. Pub. 31 Minerals of Nevada
      • Nye Co.
        • Gabbs District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    • Pennsylvania
      • Lancaster Co.
        • Fulton Township
    		FM newsletter vol.31 no.1 Jan-Mar '01 pg.6
    Personally Collected 4/12/2008, Mark J. Sigouin, Pennsylvania Licenced Professional Geologist
    Mineral and/or Locality
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