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The more detailed formula is (Al,Sc)2(Ti,Zr)3O9.
Crystal System:
In honour of Chi Ma, Director of the Geological and Planetary Sciences Division–Analytical Facility at the Caltech (California, USA), for him being recognized as a nano-scale mineralogical expert and discoverer of many new minerals.
Isostructural with:
The Al analogue of schreyerite. The first purely Al-Ti oxide mineral. The more detailed formula is (Al,Sc)2(Ti,Zr)3O9.

Machiite is depleted in the 16O isotope as compared to closely associated corundum. It is supposed to be formed as a condensate of the solar nebula gas or crystallization of a refractory melt.

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Classification of MachiiteHide

Approved, Pending publication
Approval Year:

Chemical Properties of MachiiteHide


The more detailed formula is (Al,Sc)2(Ti,Zr)3O9.

Crystallography of MachiiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 17.102 Å, b = 5.025 Å, c = 7.058 Å
β = 106.6°
a:b:c = 3.403 : 1 : 1.405
Unit Cell V:
581.27 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:

Type Occurrence of MachiiteHide

Place of Conservation of Type Material:
Mteorite collections of the Hawai’i Institute of Geophysics and Planetology, University of Hawai’i at Mānoa, 1680 East-West Road, Honolulu, Hawai’i 96822, USA, Murchison section UH80

Synonyms of MachiiteHide

Other InformationHide

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 MachiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Knot, A.N. (2016): Machiite, IMA 2016-067. CNMNC Newsletter No. 34, December 2016, page 1317; Mineralogical Magazine: 80: 1315–1321

Internet Links for MachiiteHide

Localities for MachiiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
  • Victoria
    • City of Greater Shepparton
      • Murchison
Knot, A.N. (2016): Machiite, IMA 2016-067. CNMNC Newsletter No. 34, December 2016, page 1317; Mineralogical Magazine: 80: 1315–1321
  • Lower Silesia
    • Kłodzko District
      • Nowa Ruda (Neurode)
        • Przygórze
Ł. Kruszewski, PXRD and microprobe data
Mineral and/or Locality  
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