Sri Lanka (original) (raw)

Description: The forsterite from this locality has a relateively high fayalite content, and is promoted as dunilite in the gem market. The composition is published as CaO: 0.09, MgO:38.87, MnO: 0.31, FeO: 21.69, SiO2: 37.61. Total 98.57 wt% ( Dunil Palitha Gunaseker(2008): Dunilite- Discovered by Mr Dunil Palitha Gunasekera ). Individual crystals up to 30cm are known, often with a tabular habitus and dark grayish green colour. Twins and crystal aggregates are not rare. (Muller)

ⓘ 'Gadolinite'

ⓘ Gahnite

Formula: ZnAl2O4

ⓘ 'Garnet Group'

Formula: X3Z2(SiO4)3

Localities: Reported from at least 16 localities in this region.

ⓘ Gedrite

Formula: ◻{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2

ⓘ Geikielite (TL)

Formula: MgTiO3

Localities:

Rakwana, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Balangoda, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Kollonnagam, Rakwana, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Sri Lanka

Description: Gem gravels.

ⓘ Goethite

Formula: α-Fe3+O(OH)

ⓘ Gold

Formula: Au

ⓘ Graphite

Formula: C

Localities: Reported from at least 10 localities in this region.

ⓘ Grossular

Formula: Ca3Al2(SiO4)3

Localities:

Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Okkampitiya, Monaragala District, Uva Province, Sri Lanka
Kataragama (Katharagama; Katirkamam), Monaragala District, Uva Province, Sri Lanka
Sri Lanka

ⓘ Grossular var. Hessonite

Formula: Ca3Al2(SiO4)3

Localities:

Okkampitiya, Monaragala District, Uva Province, Sri Lanka
Kataragama (Katharagama; Katirkamam), Monaragala District, Uva Province, Sri Lanka
Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Sri Lanka

ⓘ Gypsum

Formula: CaSO4 · 2H2O

References:

ⓘ Hematite

Formula: Fe2O3

Localities:

Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Eppawala, Anuradhapura District, North Central Province, Sri Lanka
Seruwila deposit, Anuradhapura District, North Central Province, Sri Lanka

ⓘ Hercynite

Formula: Fe2+Al2O4

Localities:

Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Kaluganga valley, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Katukubura Hills, Kolonne, Embilipitiya, Ratnapura District, Sabaragamuwa Province, Sri Lanka

ⓘ 'Hornblende Root Name Group'

Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2

Localities: Reported from at least 6 localities in this region.

ⓘ Hydroxylapatite

Formula: Ca5(PO4)3(OH)

ⓘ Ilmenite

Formula: Fe2+TiO3

Localities: Reported from at least 11 localities in this region.

ⓘ 'Indicolite'

Formula: A(D3)G6(T6O18)(BO3)3X3Z

ⓘ Kaolinite

Formula: Al2(Si2O5)(OH)4

ⓘ 'K Feldspar'

ⓘ 'K Feldspar var. Adularia'

Formula: KAlSi3O8

ⓘ Kornerupine

Formula: Mg3Al6(Si,Al,B)5O21(OH)

Localities:

Weligama, Matara District, Southern Province, Sri Lanka
Elahera District, North Central Province, Sri Lanka
Rakwana, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Sri Lanka
Homagama pegmatite, Colombo District, Western Province, Sri Lanka

ⓘ Kyanite

Formula: Al2(SiO4)O

ⓘ 'Liddicoatite'

Formula: Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)

ⓘ 'Limonite'

ⓘ Lucchesiite (TL)

Formula: CaFe2+3 Al6(Si6O18)(BO3)3(OH)3O

Type Locality:

ⓘ Magnesiotaaffeite-2N’2S (TL)

Formula: Mg3Al8BeO16

Localities:

Niriella (Niri-Ella), Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Kuruwita, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Bakamuna, Polonnaruwa District, North Central Province, Sri Lanka
Sri Lanka

ⓘ Magnesiotaaffeite-6N’3S

Formula: Mg2BeAl6O12

ⓘ Magnesite

Formula: MgCO3

ⓘ 'Magnesite-Siderite Series'

References:

ⓘ Magnetite

Formula: Fe2+Fe3+2O4

Localities: Reported from at least 6 localities in this region.

ⓘ Malachite

Formula: Cu2(CO3)(OH)2

References:

ⓘ Marcasite

Formula: FeS2

ⓘ Microcline

Formula: K(AlSi3O8)

ⓘ Microcline var. Amazonite

Formula: K(AlSi3O8)

ⓘ 'Microlite Group'

Formula: A2-mTa2X6-wZ-n

ⓘ 'Monazite'

Formula: REE(PO4)

Localities: Reported from at least 6 localities in this region.

ⓘ Monazite-(Ce)

Formula: Ce(PO4)

ⓘ 'Moonstone'

Localities: Reported from at least 6 localities in this region.

ⓘ Muscovite

Formula: KAl2(AlSi3O10)(OH)2

ⓘ Muscovite var. Sericite

Formula: KAl2(AlSi3O10)(OH)2

References:

ⓘ Nepheline

Formula: Na3K(Al4Si4O16)

ⓘ 'Olivine Group'

Formula: M2SiO4

ⓘ Opal

Formula: SiO2 · nH2O

ⓘ Orthoclase

Formula: K(AlSi3O8)

ⓘ 'Orthopyroxene Subgroup'

ⓘ Pargasite ?

Formula: NaCa2(Mg4Al)(Si6Al2)O22(OH)2

Description: There are no analytical data confirming a pargasite composition for the amphiboles from this locality.

ⓘ Perovskite

Formula: CaTiO3

ⓘ Phenakite

Formula: Be2SiO4

ⓘ Phlogopite

Formula: KMg3(AlSi3O10)(OH)2

Localities: Reported from at least 7 localities in this region.

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi2]O8

Localities: Reported from at least 6 localities in this region.

ⓘ Pyrite

Formula: FeS2

Localities: Reported from at least 9 localities in this region.

ⓘ Pyrope

Formula: Mg3Al2(SiO4)3

ⓘ 'Pyrope-Spessartine Series'

ⓘ 'Pyrope-Spessartine Series var. Umbalite'

Formula: Mg3Al2(SiO4)3 - Mn3Al2(SiO4)3

ⓘ 'Pyroxene Group'

Formula: ADSi2O6

References:

ⓘ Pyrrhotite

Formula: Fe1-xS

ⓘ Quartz

Formula: SiO2

Localities: Reported from at least 18 localities in this region.

ⓘ Quartz var. Agate

ⓘ Quartz var. Amethyst

Formula: SiO2

Localities:

Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Katukubura Hills, Kolonne, Embilipitiya, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Avissawella, Colombo District, Western Province, Sri Lanka
Sri Lanka

ⓘ Quartz var. Carnelian

ⓘ Quartz var. Citrine

Formula: SiO2

ⓘ Quartz var. Rock Crystal

Formula: SiO2

ⓘ Quartz var. Rose Quartz

Formula: SiO2

Localities:

Rakwana, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Kandy, Kandy District, Central Province, Sri Lanka
Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka

ⓘ Quartz var. Smoky Quartz

Formula: SiO2

ⓘ Rutile

Formula: TiO2

Localities: Reported from at least 9 localities in this region.

ⓘ Rutile var. Ilmenorutile ?

Formula: (Ti,Nb)O2

References:

ⓘ Rutile var. Niobium-bearing Rutile

Formula: (Ti,Nb)O2

ⓘ Samarskite-(Y)

Formula: YFe3+Nb2O8

ⓘ Sanidine

Formula: K(AlSi3O8)

ⓘ Saponite

Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O

ⓘ Sapphirine

Formula: Mg4(Mg3Al9)O4[Si3Al9O36]

Localities:

Munwatte, Nuwara Eliya District, Central Province, Sri Lanka
Hakurutale, Nuwara Eliya District, Central Province, Sri Lanka
Katukubura Hills, Kolonne, Embilipitiya, Ratnapura District, Sabaragamuwa Province, Sri Lanka

ⓘ 'Scapolite'

Localities: Reported from at least 7 localities in this region.

ⓘ Scheelite

Formula: Ca(WO4)

Localities:

Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Gem gravels, Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka
Bakamuna, Polonnaruwa District, North Central Province, Sri Lanka
Sri Lanka

ⓘ Schorl

Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

ⓘ Serendibite (TL)

Formula: Ca4[Mg6Al6]O4[Si6B3Al3O36]

ⓘ 'Serpentine Subgroup'

Formula: D3[Si2O5](OH)4

Description: Purchased in Sri Lanka in 2019.

ⓘ Siderite

Formula: FeCO3

ⓘ Sillimanite

Formula: Al2(SiO4)O

Localities: Reported from at least 10 localities in this region.

ⓘ Sinhalite (TL)

Formula: MgAl(BO4)

Localities: Reported from at least 6 localities in this region.

Description: Specimens collected in gem-bearing gravels.

ⓘ Smythite

Formula: (Fe,Ni)3+xS4 (x=0-0.3)

References:

ⓘ Spessartine

Formula: Mn2+3Al2(SiO4)3

ⓘ Spinel

Formula: MgAl2O4

Localities: Reported from at least 19 localities in this region.

ⓘ Spinel var. Ceylonite

Formula: MgAl2O4

ⓘ Spinel var. Gahnospinel

Formula: (Mg,Zn)Al2O4

ⓘ Spinel var. Pleonaste

Formula: (Mg,Fe)Al2O4

ⓘ 'Spinel Subgroup'

Formula: A2+D3+2O4

Description: Dark, individual octahedral crystal up to 5 cm on the edge and 10 cm total length. No analysis has been published, but the spinels are not ferro-magnetic.

ⓘ Spodumene

Formula: LiAlSi2O6

ⓘ Spodumene var. Hiddenite

Formula: LiAlSi2O6

ⓘ Spodumene var. Kunzite

Formula: LiAlSi2O6

ⓘ Srilankite (TL)

Formula: ZrTi2O6

Type Locality:

ⓘ Staurolite

Formula: Fe2+2Al9Si4O23(OH)

ⓘ Stibiotantalite