System: Orthorhombic Colour: Colourless, grey, ...
Lustre: Vitreous, Dull Hardness: 2 - 2½
Name: After Paolo Mascagni (1755-1815), Professor of Anatomy, University of Siena, who first described the natural material.
Mascagnite-Arcanite Series. Slightly hygroscopic.
Occurs at active volcanic fumaroles, hot springs, and on burning coal mine dumps.
Classification of Mascagnite
IMA status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Nickel-Strunz 10th (pending) edition ID: 7.AD.05
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
D : With only large cations
Hey's CIM Ref.: 25.1.8
25 : Sulphates
1 : Sulphates of the alkali metals and ammonium
Physical Properties of Mascagnite
Lustre: Vitreous, Dull
Diaphaneity (Transparency): Transparent, Translucent, Opaque
Colour: Colourless, grey, yellowish-grey, yellow; colourless in transmitted light
Hardness (Mohs): 2 - 2½
Tenacity: Sectile
Cleavage: Distinct/Good
On {001}.
Parting: Twin gliding with K1(110), K2(13¯0).
Fracture: Irregular/Uneven
Density (measured): 1.768 g/cm3
Density (calculated): 1.765 g/cm3
Crystallography of Mascagnite
Crystal System: Orthorhombic
Class (H-M): mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters: a = 7.78Ã…, b = 5.99Ã…, c = 10.63Ã…
Ratio: a:b:c = 1.299 : 1 : 1.775
Unit Cell Volume: V 495.38 ų (Calculated from Unit Cell)
Morphology: Well-formed natural crystals are rare. Mealy crusts and stalactitic forms. Artificial crystals equant to short prismatic [001], frequently flattened {010}; also prismatic [100]; also flattened {100}, rare.
Twinning: On {110} common, often repeated yielding a pseudo-hexagonal habit; also polysynthetic.
Optical Data of Mascagnite
Type: Biaxial (+)
RI values: nα = 1.520 nβ = 1.523 nγ = 1.533
2V: Measured: 52° , Calculated: 58°
Maximum Birefringence: δ = 0.013
![[image]](http://mowser.com/img?url=http%3A%2F%2Fwww.mindat.org%2Fmin-2584.html%2Flevy.php%3Frate%3D0.013)
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief: Low
Dispersion: relatively strong
Chemical Properties of Mascagnite
Relationship of Mascagnite to other Species
Other Names for Mascagnite
Other Information
Thermal Behaviour: Melts when heated in air and decomposes at a low temperature.
Other Information: Slightly hygroscopic. Soluble in water.
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 Mascagnite
Reference List: Sage, B.G. (1777) Eléméns de minéralogie docimastique, second edition, 2 volumes: 1: 62 (as Sel ammoniac vitriolique).
Mascagni (1779) Dei Lagoni del Senese..., Sienna: 36 (as Sale ammoniacale composto d'acido sulfureo)
Haüy, R.J. (1822) Traité de minéralogie, second edition, 4 volumes, with fol. Atlas: 2: 220 (as Ammoniaque sulfatée).
Mitscherlich (1830) Annalen der Physik, Halle, Leipzig: 18: 169 (artificial crystals).
Tutton (1904) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 38: 602.
Groth, P. (1908) Chemische Krystallographie. Leipzig. 5 volumes: vol. 2: 322.
Fischer (1911) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Beil.-Bd., Stuttgart: 32: 1.
Goldschmidt, V. (1920) Atlas der Krystallformen. 9 volumes, atlas, and text, vol. 6: 10.
Ogg (1928) Philosophical Magazine and Journal of Science: 5: 354.
Taylor and Boyer (1928) Memoires of the Manchester Literary and Philosophical Society: 72: 125.
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: 398-399.
Journal of the Physical Society of Japan: 50: 1266-1274.
Periodico di Mineralogia (1985): 54: 32.
Karsten, D.L.G. (1800) Mineralogische Tabellen, Berlin. First edition: 40, 75 (as Maskagnin).
Articles/Blogs about Mascagnite
Internet Links for Mascagnite
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Localities for Mascagnite
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