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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 (9)
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.10Halloysite-10Å
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
·2H
 
2
O
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
Al
 
2
Si
 
2
O
 
5
(OH)
 
4
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)
Esperanto names:
Nakrito
German names:
Nacrit
Russian names:
Накрит
Spanish names:
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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  • Nacrite details from Handbook of Mineralogy (PDF)
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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.
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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.
    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
      • Bustillos Province
        • Llallagua
    		Min Rec (2006) 37:117-162
      • Potosí City
    		[MinRec 32:465]
    Canada
     
    • Québec
      • Beauharnois Co.
    		Horvath collection
      • Deux-Montagnes Co.
        • Saint-Eustache
    		Sabine (1983) & Horváth collection
      • Vaudreuil Co.
        • Coteau-du-Lac
    		Sabina (1983) & Horváth collection
        • Ste-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
    Wittern: "Mineralfundorte in Deutschland", 2001
    Wittern: "Mineralfundorte in Deutschland", 2001
        • Oberwiesenthal
          • Niederschlag
    		Lapis, 19 (4), 13-22+50.
    No reference listed
        • Schwarzenberg District
    		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
     
    • Skåne
      • Bromölla
        • Näsum
    		No reference listed
    • Västerbotten
      • Skellefteå
    		No reference listed
    UK
     
    • England
      • Cumbria
        • South Eastern Region (Westmorland)
          • Eastern Fells
            • Shap
    		BMS Database
      • Devon
        • South Devon
          • Torquay
    Ukraine
     
    • Kiev Oblast'
      • Kremenchug Reservoir
    USA
     
    • Arizona
    		azminerals.com
        • Ash Peak District
          • Duncan
    		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
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