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Nacrite

Big Photo

Vrchoslav fluorite deposit, Krupka (Graupen), Krušné Hory Mts (Erzgebirge), Ústí Region, Bohemia (Böhmen; Boehmen), Czech Republic
© Petr Fuchs

Show Nacrite Photos (10)
Formula:
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
System:MonoclinicColour:White, grey, yellowish, ...
Lustre:PearlyHardness:2 - 2½
Name:From the french, Nacre (mother of pearl) alluding to its lustre.
This page provides mineralogical data about Nacrite.

Classification of Nacrite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Explanation of status:Nacrite appears to be a polytype of kaolinite (as does dickite).
Strunz 8th edition ID:8/H.25-30
Nickel-Strunz 10th (pending) edition ID:9.ED.05

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
Dana 7th edition ID:71.1.1.3
Hey's CIM Ref.:15.7

15 : Silicates of Aluminum
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Type Occurrence of Nacrite

Type Locality:Einigkeit Mine, Brand-Erbisdorf, Freiberg District, Erzgebirge, Saxony, Germany
Year of Discovery:1807

Physical Properties of Nacrite

Lustre:Pearly
Colour:White, grey, yellowish, brownish, etc.
Streak:White
Hardness (Mohs):2 - 2½

Crystallography of Nacrite

Crystal System:Monoclinic
Class (H-M):m - Domatic
Space Group:Bb {B1 1b} {Cc} {C1c1}
Cell Parameters:a = 5.14Å, b = 8.94Å, c = 14.4Å
β = 113.7°
Ratio:a:b:c = 0.575 : 1 : 1.611
Unit Cell Volume:V 605.90 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
For nacrite-2M2:(
(
7.18(100)
4.41(30)
4.36(80)
4.13(70)
3.59(80)
2.43(60)
2.40(40)

Optical Data of Nacrite

Type:Biaxial (-)
RI values: nα = 1.557 nβ = 1.562 nγ = 1.563
2V:Measured: 40° , Calculated: 48°
Maximum Birefringence:δ = 0.006

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

Chemical Properties of Nacrite

Formula:
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
Essential elements:Al, H, O, Si
All elements listed in formula:Al, H, O, Si

Relationship of Nacrite to other Species

Member of:Serpentine Group
Related Minerals - Nickel-Strunz Grouping):

- +
9.ED.05Dickite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.05Kaolinite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.05Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
(Si,Al)
 
2
O
 
5
(OH)
 
4
9.ED.10Halloysite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.10Hisingerite
Fe
3+
2
Si
 
2
O
 
5
(OH)
 
4
·2H
 
2
O
9.ED.10Halloysite-7Å
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Amesite
Mg
 
2
Al[(OH)
 
4
|AlSiO
 
5
]
9.ED.15Antigorite
(Mg,Fe
2+
 
)
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
9.ED.15Berthierine
(Fe,Fe,Mg)
 
2-3
(Si,Al)
 
2
O
 
5
(OH)
 
4
9.ED.15Brindleyite
(Ni,Mg,Fe)
 
2
Al(Si,Al)O
 
5
(OH)
 
4
9.ED.15Caryopilite
(Mn,Mg)
 
3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Chrysotile
Mg
 
3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Cronstedtite
Fe
2+
2
Fe
3+
 
[(Si,Fe
3+
 
)
 
2
O
 
5
](OH)
 
4
9.ED.15Fraipontite
(Zn,Al)
 
3
[(OH)
 
4
|(Si,Al)
 
2
O
 
5
]
9.ED.15Greenalite
Fe
 
2-3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Kellyite
Mn
2+
2
Al[(OH)
 
4
|AlSiO
 
5
]
9.ED.15Lizardite
Mg
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
9.ED.15Manandonite
LiAl
 
4
Si
 
3
BO
 
10
(OH)
 
6
9.ED.15Népouite
(Ni,Mg)
 
3
Si
 
2
O
 
5
(OH)
 
4
9.ED.15Pecoraite
Ni
 
3
[(OH)
 
4
|Si
 
2
O
 
5
]
9.ED.20Allophane
(Al
 
2
O
 
3
)(SiO
 
2
)
 
1.3-2
·2.5-3H
 
2
O
9.ED.20Chrysocolla
(Cu,Al)
 
2
H
 
2
Si
 
2
O
 
5
(OH)
 
4
·nH
 
2
O
9.ED.20Imogolite
Al
 
2
SiO
 
3
(OH)
 
4
9.ED.20Neotocite
(Mn,Fe,Mg)SiO
 
3
·H
 
2
O
9.ED.25Bismutoferrite
Fe
3+
2
Bi[OH|(SiO
 
4
)
 
2
]
9.ED.25Chapmanite
Fe
3+
2
Sb
3+
 
[OH|(SiO
 
4
)
 
2
]
Related Minerals - Hey's Index Grouping:

- +
15.1Andalusite
Al
 
2
[O|SiO
 
4
]
15.2Kyanite
Al
 
2
[O|SiO
 
4
]
15.3Sillimanite
Al
 
2
[O|SiO
 
4
]
15.4Mullite
Al
 
8
[(O,OH,F)|(Si,Al)O
 
4
]
 
4
15.5Pyrophyllite
Al
 
2
Si
 
4
O
 
10
(OH)
 
2
15.6Dickite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
15.8Kaolinite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
15.9Metahalloysite
15.10Halloysite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
15.11Allophane
(Al
 
2
O
 
3
)(SiO
 
2
)
 
1.3-2
·2.5-3H
 
2
O
Related Minerals - Dana Grouping):

- +
71.1.1.1Dickite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
71.1.1.2Kaolinite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
71.1.1.4Halloysite
Al
 
2
Si
 
2
O
 
5
(OH)
 
4

Other Names for Nacrite

Synonyms:
Nacrite (of Brongniart)
Other Languages:
Esperanto:Nakrito
German:Nacrit
Russian:Накрит
Spanish:Nacrita

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 Nacrite

Reference List:Brongniart, A (1807); Traité élémentaire de Minéralogie, Paris I, 505.

American Mineralogist (1930): 15: 34.

American Mineralogist (1963): 48: 1196.

Clays and Clay Minerals (1994): 46.

Gaines, Richard V., H. Catherine, W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig (1997), Dana's New Mineralogy : The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana: 1407.

Internet Links for Nacrite

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    Localities for Nacrite

    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.
    (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.
    Austria
     
    • Carinthia
      • Hohe Tauern Mts
        • Hafner group
          • Rennweg
            • Katschberg Mt.
    		G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
    • Salzburg
      • Lungau
        • Murwinkel
          • Schellgaden
            • Katschberg Mt.
    		A. Strasser: Die Minerale Salzburgs (1989)
    Bolivia
     
    • La Paz Department
      • Larecaja Province
        • Chacapa
    		Federico Ahlfeld and Jorge Munoz Reyes: Las Especies Minerales de Bolivia (Banco Minero de Bolivia, 1955)
      • Murillo Province
        • Mt Huayna Potosí (Huaina Potosi)
    		[MinRec 32:465]
    • Potosí Department
      • Potosí City
    		[MinRec 32:465]
      • Rafael Bustillo Province
        • Llallagua
    		Min Rec (2006) 37:117-162
    Canada
     
    • Québec
      • Laurentides
        • Deux-Montagnes RCM
          • Saint-Eustache
    		Sabine (1983) & Horváth collection
      • Montérégie
        • Beauharnois-Salaberry RCM
    		Horvath collection
        • Vaudreuil-Soulanges RCM
          • Coteau-du-Lac
    		Sabina (1983) & Horváth collection
          • Sainte-Justine-de-Newton
    		Horváth Collection - confirmed by visual & XRD
    China
     
    • Fujian Province
      • Fuzhou Prefecture
        • Fuzhou City
    		Xinfeng Wu and Wenyuan Cui (1999): Acta Petrologica et Mineralogica 18(2), 186-192.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Central Bohemia Region
        • Čáslav (Tschaslau)
    		Duda, Rejl, Slivka: "Mineralien", 1991
      • Ústí Region
        • Krušné Hory Mts (Erzgebirge)
    		Lapis 23(4), 18-34 (1998)
    X ray analysed
    France
     
    • Brittany
      • Finistère
        • Pont-de-Buis-lès-Quimerch
          • Lopérec
    		P Le Roch collection
      • Morbihan
    		Le Règne Minéral, (Hors Série 7), 42-58
    • Languedoc-Roussillon
      • Aude
        • Couiza
          • Terroles
    		C.Berbain, G.Favreau - Cahier des micromonteurs n° 2-2000. pp 18-22
      • Hérault
        • Lodève
    		C. Lemanski, Jr. (re-entry of lost Mindat data).
    Germany
     
    • Baden-Württemberg
      • Black Forest
    		Lapis 21(12), 43 (1996)
        • Lahr
          • Schweighausen
    		K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992
    Lapis 1985(5), 17-20
    • Bavaria
      • Franconia
        • Franconian Forest
          • Bad Berneck
    		F. Müller: "Bayerns steinreiche Ecke", 2nd ed., Oberfränkische Verlagsanstalt und Druckerei GmbH (Hof), 1984
          • Hof
            • Joditz
    		Weiss: "MIneralfundstellen, Deutschland West", 1990
      • Upper Palatinate
        • Schwandorf
    		No reference listed
    • Lower Saxony
      • Harz Mts
        • Braunlage
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
        • St Andreasberg District
    		No reference listed
    • North Rhine-Westphalia
      • Ruhr Coal Mining area
        • Essen
    		Weiss: "Mineralfundstellen, Deutschland West", 1990
        • Herne
    		Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Rhineland-Palatinate
      • Kirchheimbolanden
        • Dannenfels
    		Kohout, K. (2008): Der Steinbruch Giro am Mannbühl: Spitzenfunde aus 27 Jahren. Lapis, 33 (5), 32-35.
      • Lahn valley
    		Wittern: "Mineralfundorte in Deutschland", 2001
    • Saarland
      • Nonnweiler
        • Eisen
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Saxony
      • Chemnitz
        • Penig
    		Wittern: "Mineralfundorte in Deutschland", 2001, 146
      • Erzgebirge
        • Altenberg
    		Mineralien-Welt, (2), 17-39.
        • Clausnitz - Sayda District
          • Sayda
    		Wittern: "Mineralfundorte in Deutschland", 2001
        • Ehrenfriedersdorf
    		Wittern: "Mineralfundorte in Deutschland", 2001
        • Freiberg District
          • Brand-Erbisdorf
    		Mineralogical Magazine 1908 15 : 124-127
        • Johanngeorgenstadt District
    		Wittern: "Mineralfundorte in Deutschland", 2001
    Wittern: "Mineralfundorte in Deutschland", 2001
        • Oberwiesenthal
          • Niederschlag
    		Lapis, 19 (4), 13-22+50.
    No reference listed
        • Schwarzenberg District
          • Beierfeld
    		Lapis, 16 (6), 13-20+58.
          • Pöhla
    		Wittern: "Mineralfundorte in Deutschland", 2001
    • Thuringia
      • Gera
    		T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
      • Wurzbach
        • Weitisberga
    		Wittern: "Mineralfundorte in Deutschland", 2001
    Germany & Czech Republic
     
    • Saxony & Ústí Region (Bohemia; Böhmen; Boehmen)
      • Erzgebirge; Krusné Hory Mts
    		Lapis 17(2), 31-35 (1992)
    Hungary
     
    • Heves Co.
      • Mátra Mts.
        • Gyöngyösoroszi
    		Koch: Minerals of Hungary, 1985
    Italy
     
    • Piedmont
      • Torino Province
        • Canavese District
          • Chiusella Valley
            • Traversella
    		Mineralogical Record, 4 (1), 39-41
    Japan
     
    • Hokkaido Island
      • Iburi Province
    Mexico
     
    Clay Miner. 29:452-453 (1981).
    Namibia
     
    • Erongo Region
      • Swakopmund District
        • Swakopmund
    		Mineralogical Record: 36(4): 317-335.
    Slovakia
     
    • Banská Bystrica Region
      • Javorie Mts
    		Rojkovičová,Ľ., 1982: Rudná mineralizácia v Javorí. Min.Slovaca, 14,5,461 – 470
      • Štiavnica Mts
    		Ďuďa R.,Kotuľak P., Káňa R., 1993: Bergbau und Mineralien von Banská Štiavnica (Schemnitz), Slowakei. Emser Hefte, 14, 3, 1-70, Haltern
      • Western Slovenské Rudohorie Mts
        • Sirk (Szirk)
    		Grecula,P. et al., 1995: Ložiska nerastných surovín Slovenského rudohoria. Zväz.1, Bratislava, 834 s
        • Tisovec
    		Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    • Košice Region
      • Eastern Slovenské Rudohorie Mts
        • Rožňava (Rozsnyo; Rosenau) Mining District
    		Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    Varček C., 1957: Prehľad paragenetických pomerov rudných ložísk Gemera. Geol. Práce. Zoš, 46, p. 107-131.
    Ďuďa R., Peterec D., 1995 : Die Mineralien der siderit - baryt lagersttäte von Rudňany ( Kotterbach ) in der Slowakei. Mineralien Welt /Haltern/, 1, s.20 - 31
    • Trenčín region
      • Vtáčnik Mts
    		Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    South Africa
     
    • KwaZulu-Natal Province
      • Durban
        • Umhlatuzana valley
    		Cairncross, B. & Dixon, R. (1995). Minerals of South Africa. Geological Society of South Africa: Linden.
    South Korea
     
    • Gyeongsangbuk-do (Kyongsang-bukto; Gyeongsangbugdo)
      • Bonghwa-gun
    		G. Grundmann collection # 128, originally sold by Kristalldruse.
    Spain
     
    • Andalusia
      • Málaga
    		M.D. Ruiz Cruz, B. Andreo : "Tosudite in very low-grade metamorphic graywackes from the Malaga area (Betic Cordilleras, Spain)", Eur. J. Mineral. , 1996, 8, 1391-1399.
    • Catalonia
      • Tarragona
        • Priorat
          • Bellmunt del Priorat
    Sweden
     
    • Västerbotten
      • Skellefteå
    		No reference listed
    UK
     
    • England
      • Cumbria
        • South Eastern Region (Westmorland)
          • Eastern Fells
            • Shap
    		BMS Database
      • Devon
        • South Devon
          • Torquay
      • Leicestershire
        • Groby
    		Mineralogical Magazine 1952 29 : 973-973
    Ukraine
     
    • Crimea Oblast'
      • Crimea peninsula
        • Alushta
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    • Kiev Oblast'
      • Kremenchug Reservoir
    USA
     
    • Arizona
    		azminerals.com
        • Steeple Rock District (Duncan District)
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 203, 310.
    • Colorado
      • El Paso Co.
    		U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    "Minerals of Colorado, updated & revised", p. 14, by Eckel, Edwin B., 1997
    Minerals of Colorado (1997) Eckels, E. B.
      • Jefferson Co.
    		Minerals of Colorado (1997) E.B. Eckels
      • Ouray Co.
    		Minerals of Colorado (1997) E.B. Eckels
    • Connecticut
      • Fairfield Co.
    		Januzzi, 1976. Mineral Localities of CT and Southeastern NY State
      • Hartford Co.
    		Januzzi, 1976. Mineral Localities of CT & SE NY State
    • Michigan
      • Marquette Co.
        • Marquette iron range
          • Palmer
    		Mineralogy of Michigan (2004) Heinrich & Robinson
    • Nevada
      • Elko Co.
        • Cornucopia District
    		NBMG Spec. Pub. 31 Minerals of Nevada
      • Washoe Co.
        • Cottonwood District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    • New Mexico
      • Colfax Co.
    		Minerals of New Mexico 3rd ed.
    • Rhode Island
      • Providence Co.
    		Miller, 1972. Minerals of Rhode Island.
    • Virginia
      • Rockbridge Co.
        • Glasgow
    		Rocks & Min.: 60:157.
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 3rd Nov 2009 13:49:03