Sudoite

Currently, Sudoite is a topic that has captured the attention of a wide public due to its impact on different areas of society. Since its emergence, Sudoite has generated debates and discussions ranging from its relevance in history to its influence on people's daily lives. In this article, we will explore in detail the most significant aspects related to Sudoite, analyzing its origins, evolution and the implications it has today. Additionally, we will examine how Sudoite has shaped different aspects of culture, politics, economics and technology, showing its influence in different contexts over time.

Sudoite
General
CategoryChlorite_group
FormulaMg2Al3(Si3Al)O10(OH)8
Crystal systemMonoclinic
Identification
ColorWhite to light green
Mohs scale hardness2.5–3.5
Lusterpearly, dull
Refractive indexnα = 1.581 à 1.583
nβ = 1.584 à 1.589
nγ = 1.591 à 1.601
Birefringencebiaxial (-) ; δ = 0.010 to 0.018
2V = 64 to 70° (measured)
2V = 68 to 72° (calculated)
References[1][2]

Sudoite is a mineral from the chlorite group. It was named after Toshio Sudo (1911-2000), professor of mineralogy at the University of Tokyo, in Japan, and a pioneer of clay science.[3] The mineral tosudite also bears his name. It was approved as a valid species by the International Mineralogical Association in 1966.

Characteristics

Sudoite is a clay mineral with chemical formula defined as Mg2Al3(Si3Al)O10(OH)8. It has a monoclinic crystal system. Its hardness on the Mohs scale is between 2.5 and 3.5.

Classification

Following the Nickel–Strunz classification, it is contained in the "09.EC.55" group:

Members of the 9.EC.55 group
Mineral Formula Symmetry group Space group
Baileychlore (Zn,Al)
3(OH)
8		 1 or 1 C1 or C1
Borocookeite Li
1+3xAl
4-x(BSi
3)O
10(OH,F)
8 (x ≤ 0,33)		 2/m C2/m
Chamosite (Fe,Mg,Fe)
5Al(Si
3Al)O
10(OH,O)
8		 2/m C2/m
Clinochlore (Mg,Fe)
5Al(Si
3Al)O
10(OH)
8		 2/m C2/m
Cookeite LiAl
4(Si
3Al)O
10(OH)
8		 1, 2 or 2/m C1, C2 or Cc
Donbassite Al
2(OH)
8		 2/m C2/m
Franklinfurnaceite Ca(Fe,Al)Mn
4Zn
2Si
2O
10(OH)
8		 2 C2
Glagolevite NaMg
6(OH,O)
8·H
2O		 1 C1
Gonyerite Mn
3(OH,O)
8		 unknown
Nimite (Ni,Mg,Fe)
5Al(Si
3Al)O
10(OH)
8		 2/m C2/m
Odinite (Fe,Mg,Al,Fe,Ti,Mn)
2,5(Si,Al)
2O
5(OH)
4		 m Cm
Orthochamosite (Fe,Mg,Fe)
5Al(Si
3Al)O
10(OH,O)
8		 unknown
Pennantite Mn
5Al(Si
3Al)O
10(OH)
8		 2/m C2/m
Sudoite Mg
2(Al,Fe)
3Si
3AlO
10(OH)
8		 2/m C2/m

Formation

It has been first discovered in the Knollenberg Keuper formation, in the village of Plochingen, Stuttgart Region (Baden-Württemberg, Germany).[4] Despite being an unlikely mineral, it has been described in every continent but Antarctica and Oceania. It is found mainly in hydrothermal or high-pressure/low-temperature (HP/LT) metamorphism contexts[5][6][7]

Use

This mineral has been used as gemstone for the production of personal ornaments, beads and pendants, during the Early Ceramic Age (500 BC – 500 AD), in the Lesser Antilles.[8] The precise source of such formation of sudoite allowing to carve artifacts in rather large blocks remain unknown.

References

  1. ^ Sudoite mineral information and data Mindat
  2. ^ Sudoite Mineral Data Webmineral
  3. ^ Kohyama, Norihiko (2000). "In memory of Prof. Toshio Sudo". Clay Science. 11 (2): 103–105. doi:10.11362/jcssjclayscience1960.11.103.
  4. ^ v. Engelhardt, W.; Müller, Germ; Kromer, H. (1962). "Dioktaedrischer Chlorit ("Sudoit") in Sedimenten des Mittleren Keupers von Plochingen (Württ.)". Naturwissenschaften. 49 (9): 205–206. Bibcode:1962NW.....49..205V. doi:10.1007/BF00633957. ISSN 1432-1904. S2CID 21590699.
  5. ^ Fransolet, André-Mathieu; Bourguignon, P. (1978). "Di/trioctahedral chlorite in quartz veins from the Ardenne, Belgium". The Canadian Mineralogist. 16 (3): 365–373.
  6. ^ Goffé, Bruno; Michard, André; Kienast, Jean Robert; Le Mer, Olivier (1988). "A case of obduction-related high-pressure, low-temperature metamorphism in upper crustal nappes, Arabian continental margin, Oman: P-T paths and kinematic interpretation". Tectonophysics. The Ophiolites of Man. 151 (1): 363–386. Bibcode:1988Tectp.151..363G. doi:10.1016/0040-1951(88)90253-3. ISSN 0040-1951.
  7. ^ Ruiz Cruz, María Dolores; de Galdeano, Carlos Sanz (2005). "Compositional and structural variation of sudoite from the Betic Cordillera (Spain): a TEM/AEM study". Clays and Clay Minerals. 53 (6): 639–652. Bibcode:2005CCM....53..639C. doi:10.1346/CCMN.2005.0530610. hdl:10261/18786. S2CID 52107572. Retrieved 2018-10-20.
  8. ^ Queffelec, Alain; Bellot-Gurlet, Ludovic; Foy, Eddy; Lefrais, Yannick; Fritsch, Emmanuel (2021). "First identification of sudoite in the Caribbean Ceramic Age lapidary craftsmanship". Gems and Gemology. 57 (3): 206–226. doi:10.5741/GEMS.57.3.206. S2CID 245282849.


attribution translated from fr:Sudoïte