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Anhydrite

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Formula:
CaSO4
System:
Orthorhombic
Colour:
Colourless, bluish, ...
Lustre:
Vitreous, Greasy, Pearly
Hardness:
3 - 3½
Name:
Named in 1804 by Abraham Gottlieb Werner from the Greek άνυδρος ("anhydros") meaning "without water", in allusion to the lack of water in its composition, in contrast to Gypsum, which contains water.
Isostructural with Ferruccite; isostructural and isomorphous with α-BaSO4 and α-SrSO4.

Visit gemdat.org for gemological information about Anhydrite.

Classification of Anhydrite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
7.AD.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
D : With only large cations
28.3.2.1

28 : ANHYDROUS ACID AND NORMAL SULFATES
3 : AXO4
25.4.1

25 : Sulphates
4 : Sulphates of Ca, Sr and Ba
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First Recorded Occurrence of Anhydrite

Place of Conservation of First Recorded Material:
Mining Academy, Freiberg, Germany 16538
Year of Discovery:
1804

Occurrences of Anhydrite

Geological Setting:
Sedimentary evaporite deposits, cap rock of salt domes.

Physical Properties of Anhydrite

Vitreous, Greasy, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Pearly on {010}
Colour:
Colourless, bluish, blue-grey, violet, burgundy-red, white, rose-pink, brownish, reddish, grey, dark grey; colourless in transmitted light
Streak:
White, off-white, greyish
Hardness (Mohs):
3 - 3½
Tenacity:
Brittle
Cleavage:
Perfect
On {010} perfect; on {100} nearly perfect; on {001} good to imperfect.
Fracture:
Irregular/Uneven, Splintery
Density:
2.98(1) g/cm3 (Measured)    2.95 g/cm3 (Calculated)

Crystallography of Anhydrite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 6.245(1) Å, b = 6.995(2) Å, c = 6.993(2) Å
Ratio:
a:b:c = 0.893 : 1 : 1
Unit Cell Volume:
V 305.48 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals equant, or nearly so, with large pinacoidal faces. Also Thick tabular on {010}, {100}, or {001}; elongated [100] or [001]. Massive. Fine granular to scaly; fibrous (either parallel, radiated or plumose) and frequently curved. Contorted concretionary forms (bowel stone).
Twinning:
1.) On {011} as contact twins and polysynthetic lamellae (may be produced by heating or pressure); 2.) On {120} as contact twins, rare.

Crystallographic forms of Anhydrite

Crystal Atlas:
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Anhydrite no.1 - Goldschmidt (1913-1926)
Anhydrite no.6 - Goldschmidt (1913-1926)
Anhydrite no.19 - Goldschmidt (1913-1926)
Anhydrite no.28 - Goldschmidt (1913-1926)
Anhydrite no.32 - Goldschmidt (1913-1926)
Anhydrite no.37 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Opaque | Translucent | Transparent

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X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.499 (100)
2.849 (29)
2.3282 (20)
2.2090 (20)
1.8692 (16)
1.7500 (11)
1.6483 (15)
(

Optical Data of Anhydrite

Type:
Biaxial (+)
RI values:
nα = 1.567 - 1.574 nβ = 1.574 - 1.579 nγ = 1.609 - 1.618
2V:
Measured: 36° to 45°, Calculated: 44°
Max Birefringence:
δ = 0.042 - 0.044
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
Strong r < v
Pleochroism:
Visible
Comments:
Violet coloured material: X = colourless to very light yellow or rose; Y = light violet or rose; Z = violet.

Chemical Properties of Anhydrite

Formula:
CaSO4
Essential elements:
All elements listed in formula:
Common Impurities:
Sr,Ba,H2O

Relationship of Anhydrite to other Species

7.AD.05ArcaniteK2SO4
7.AD.05Mascagnite(NH4)2SO4
7.AD.10MercalliteKHSO4
7.AD.15MiseniteK8H6(SO4)7
7.AD.20Letovicite(NH4)3H(SO4)2
7.AD.25GlauberiteNa2Ca(SO4)2
7.AD.35AnglesitePbSO4
7.AD.35BaryteBaSO4
7.AD.35CelestineSrSO4
7.AD.35OlsacheritePb2(SeO4)(SO4)
7.AD.40KalistrontiteK2Sr(SO4)2
7.AD.40Palmierite(K,Na)2Pb(SO4)2
25.4.2BassaniteCaSO4 · 0.5H2O
25.4.3GypsumCaSO4 · 2H2O
25.4.4GlauberiteNa2Ca(SO4)2
25.4.5CesaniteNa3Ca2(SO4)3(OH)
25.4.6EugsteriteNa4Ca(SO4)3 · 2H2O
25.4.7HydroglauberiteNa10Ca3(SO4)8 · 6H2O
25.4.8SyngeniteK2Ca(SO4)2 · H2O
25.4.9GörgeyiteK2Ca5(SO4)6 · H2O
25.4.10PolyhaliteK2Ca2Mg(SO4)4 · 2H2O
25.4.11Koktaite(NH4)2Ca(SO4)2 · H2O
25.4.12Ye'elimiteCa4Al6(SO4)O12
25.4.13EttringiteCa6Al2(SO4)3(OH)12 · 26H2O
25.4.14BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2O
25.4.15CelestineSrSO4
25.4.16KalistrontiteK2Sr(SO4)2
25.4.17BaryteBaSO4

Other Names for Anhydrite

Other Information

Thermal Behaviour:
Inverts to α-CaSO4 at 1193°. Melting Point = ~ 1450°.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Anhydrite

Reference List:
Abbé Nicolaus Poda von Neuhaus, in: Fichtel, Johann Ehrenreich von (1794) Mineralogische Aufsätze, Wien: 228 (as Muriazit; Salzsaurer Kalk).

Werner (1800) (as Würfelspath).

Haüy, R.J. (1801) Traité de minéralogie. First edition: in 4 volumes with atlas in fol.: 2 (as Soude muriatée gypsifère (of Hall) [from Klaproth's analysis in Beiträge: 1: 307 (1795)].

Haüy, R.J. (1801) Traité de minéralogie. First edition: in 4 volumes with atlas in fol.: 4 [as Chaux sulfatée anhydre (from Bex) Vauquelin].

Ludwig, C.F. (1803) Handbuch der Mineralogie nach A.G. Werner. 2 volumes, Leipzig: 1: 51, 166 (as Cube Spar).

Ludwig, C.F. (1804) Handbuch der Mineralogie nach A.G. Werner. 2 volumes, Leipzig: 2: 170 (as Kieselgyps; Vulpinit).

Werner (1803) (as Anhydrit).

Ludwig, C.F. (1804) Handbuch der Mineralogie nach A.G. Werner. 2 volumes, Leipzig: 2: 169 (as Würfelgyps).

Klaproth, M.H. (1807) Beiträge zur chemischen Kenntniss der Mineralkörper, vol. 4: 231 (as Anhydrit; Pierre de tripes).

Hausmann, J.F.L. (1813) Handbuch der Mineralogie 3 volumes, Göttingen. Second edition: 880 (as Karstenit).

Schrauf (1860) Konigliche Akademie der Wissenschaften, Sitzber. Vienna: 39: 887.

Hessenberg (1872) Senck. Ges. Frankfurt, Abh.: 8: 1.

Mügge (1883) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: II: 258.

Danker (1886) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Beil.-Bd., Heidelberg, Stuttgart: 4: 272.

Goldschmidt, V. (1886) Index der Krystallformen der Mineralien. 3 volumes: vol. 1, 601pp.: 211.

Mülheims (1888) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 14: 228.

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 910.

Zimányi (1893) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 22: 341.

Mügge (1898) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 71.

Vater (1899) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 31: 571.

Sommerfeldt (1907) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 139 (as Metanhydrit).

Sommerfeldt (1909) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 22: 189 (as Metanhydrit).

Kolb (1911) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 49: 14, 25.

Goldschmidt, V. (1913) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 1: 56.

Emerson (1916) American Journal of Science: 42: 233.

Butler (1919) Economic Geology: 14: 581.

Veit (1922) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Beil.-Bd., Stuttgart: 45: 133.

Kinoshita (1925) Journal of the Geological Society of Tokyo: 32: 9.

Basche and Mark (1926) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 64: 22.

Dickson and Binks (1926) Philosophical Magazine and Journal of Science: 2: 114.

Hintze, Carl (1929) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 (3B): 3735, 3780.

Schaller (1932) USGS Bulletin 832.

Berek and Strieder (1933) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 86: 212.

Tertsch (1934) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 87: 326.

Przibram (1936) Kali: 30: 61.

Posnjak (1940) American Journal of Science: 238: 559.

Engelhardt (1945) Chemie der Erde, Jena: 15: 424.

Zimmer (1947) American Mineralogist: 32: 647.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 407, 424-428.

Groves, A.W. (1958), Gypsum and Anhydrite, 108 p. Overseas Geological Surveys, London.

Hardie, L.A. (1967), The gypsum-anhydrite equilibrium at one atmosphere pressure: American Mineralogist: 52: 171-200.

Canadian Mineralogist (1975): 13: 289-292.

Majzlan, J., Navrotsky, A., and Neil, J.M. (2002) Energetics of anhydrite, barite, celestine, and anglesite: a high-temperature and differential scanning calorimetry study. Geochimica et Cosmochimica Acta: 66: 1839-1850.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2003) Handbook of Mineralogy, Volume V. Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson, AZ, 813pp.: 25.

Freyer, D. & Voigt, W. (2003): Crystallization and phase stability of CaSO4 and CaSO4-based salts. Monatshefte für Chemie, 134, 693-719.

Walter, F. (2005): Anhydrit als Einschluß in alpinen Quarzen der Ostalpen. Carinthia II, 195./115., 85-96.

Walter, F. (2008): Anhydrit in Quarzkristallen aus den Ostalpen. Schweizer Strahler, 3/2008, 10-14.

Internet Links for Anhydrite

Specimens:
The following Anhydrite specimens are currently listed for sale on minfind.com.

Localities for Anhydrite

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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