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Solid Type Country/Origin
Spinel Supergroup - Isometric
Solid Type:  Solid–Primary
Tanzania, Morogoro

Record No:    883

Geology:    Spinel as alluvial deposits or as lenses in calc-silicate rocks within marbles

Origin Confidence:    4: Submitted to lab for testing/research

Frequency Seen:    Occasional

References:
  • Gübelin, E.J. and Koivula, J.I. (2005) Photoatlas of Inclusions in Gemstones, Volume 2. Basel, Switzerland, Opinio Publishers, 830 pp., RWHL* see pp. 677
Spinel Supergroup - Isometric
Solid Type:  Solid–Primary
No Origin,

Record No:    885

Geology:   

Origin Confidence:    5: Unknown

Frequency Seen:    Unknown

References:
  • Schubnel, H.-J. (1967) Determination of solid inclusions in gemstones. Journal of Gemmology, Vol. 10, No. 6, April, pp. 189–193; RWHL see pp. 176
Spinel Supergroup - Isometric
Solid Type:  Solid–Primary
Kenya, Eastern Kenya near the border with Somalia

Record No:    916

Geology:    Unknown; presumably derived from alkali basalts

Origin Confidence:    4: Submitted to lab for testing/research

Frequency Seen:    Common

References:
  • Bui, T.N., Deliousi, K., Malik, T.K. and Corte, K., de (2015) From exsolution to 'gold sheen': A new variety of corundum. Journal of Gemmology, Vol. 34, No. 8, October, pp. 678–691; RWHL* see pp. 687–688
Spinel Supergroup - Isometric
Solid Type:  Solid-Secondary
Kenya, Eastern Kenya near the border with Somalia

Record No:    917

Geology:    Unknown; presumably derived from alkali basalts

Origin Confidence:    4: Submitted to lab for testing/research

Frequency Seen:    Common

References:
  • Bui, T.N., Deliousi, K., Malik, T.K. and Corte, K., de (2015) From exsolution to 'gold sheen': A new variety of corundum. Journal of Gemmology, Vol. 34, No. 8, October, pp. 678–691; RWHL* see pp. 687–688
Spinel Supergroup - Isometric
Solid Type:  Solid–Primary
  • Chromite Isometric Fe²⁺Cr³⁺₂O₄
    Notes:
    Polymorphs:Chenmingite, Xieite
Russia, Ural Mountains near Yekaterinberg

Record No:    956

Geology:   

Origin Confidence:    4: Submitted to lab for testing/research

Frequency Seen:    Common

References:
  • Gübelin, E.J. (1973) Internal World of Gemstones. Zürich, ABC Verlag, reprinted 1983, 234 pp.; RWHL*. see pp. 55, 167

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