The pegmatite field contains more than 50 pegmatites with variable size and mineralogy. Sarbajna & Krishnamurthy (1994) describes the following types:
Type I: Unzoned perthite-mica pegmatites.
These pegmatites are typically vein like (1-10m long and 0.1 to 1 m wide). They are unzoned with quartz, microcline perthite, biotite or muscovite with magnetite. This type is most common near Gudahalli-gananguru and in areas north of Chikkopal.
Type II: Partly zoned muscovite-beryl pegmatites.
These pegmatites are typically 10-50m long and 1-2m wide. They are partly zoned with a quartz core surrounded by intergrown quartz, feldspar and muscovite. Beryl and small amounts of columbite-tantalite occurs in the quartz/feldspar zone. This type occurs 150m north of Marlagalla.
Type III: Zoned muscovite-microcline pegmatites with spodumente
The pegmatites are larger lensoids. They are 10 to 80m long and 3-5 m wide. Zoning is fairly pronounced with a central quartz core which in most cases are surrounded by a well developed zone of spodumene crystals. Thereafter comes an intermediate intermediate zone of K-feldspar and albite, followed by an albite and muscovite zone. The border zone is weathered and not well preserved.
Type IV: Pegmatites with albite replacement of spodumene.
These pegmatites exhibit a complex zonation in which spodumene has partly been replaced by albite. The pegmatites also contains columbite and tantalite. They are emplaced in schistose rocks near Marlagalla.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

11 valid minerals.

Detailed Mineral List:

ⓘ Albite

Formula: Na(AlSi₃O₈)

References:

Sarbajna, Chanchal; Krishnamurthy, Prabhakar (1994) Raremetal pegmatites of Marlagalla-Allpatna area, Mandya district, Karnataka: Some aspects on pegmatite zonation and geochemistry of pegmatitic minerals. Journal of Atomic Mineral Science, 2. 29-43

ⓘ Beryl

Formula: Be₃Al₂(Si₆O₁₈)

References:

Sarbajna, Chanchal; Sinha, R. P.; Krishnamurthy, P.; Krishna, K. V. G.; Viswanathan, R.; Banerjee, D. C. (1999) Mineralogy and Geochemistry of Alkali Beryl from the Rare Metal Bearing Pegmatites of Marlagalla-Allapatna, Mandya District, Karnataka. Journal Geological Society of India, 54 (6). 599-608 doi:10.17491/jgsi/1999/540603

ⓘ Beryl var. Alkali-beryl

Formula: Be₃Al₂(Si₆O₁₈)

References:

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

References:

ⓘ Columbite-(Fe)

Formula: Fe²⁺Nb₂O₆

Description: 6 of 8 columbite-tantalite samples analysed by Sarbajna et al. (2000) are dominantly columbite-(Fe), but the crystals are heavily zoned and the core or rim may be another mineral in the group.

References:

Sarbajna, Chanchal; Krishnamurthy, P.; Paul, A.K.; Banerjee, D.C. (2000) Mineralogical and Chemical Characteristics of Complexly-Zoned Columbite-Tantalite from the Rare Metal Pegmatites of Southern Karnataka. Journal of the Geological Society of India, 56 (5). 557-571 doi:10.17491/jgsi/2000/560508

ⓘ Columbite-(Mn)

Formula: Mn²⁺Nb₂O₆

Description: Columbite-(Fe) is the dominant columbite-tantalite mineral at this locality, but 1 of 8 samples analysed by Sarbajna et al.(2000) has a distinct columbite-(Mn) core.

References:

ⓘ 'Columbite-Tantalite'

Description: Sarbajna et al. (2000) presents 79 analyses of 8 columbite-tantalite specimens and show that they are heavily zoned, with both Fe/Mn and Nb/Ta dominant zones. Their results indicate that columbite-(Fe) is the dominant mineral in this group with 62 of 79 analyses, 4 analyses corresponds to columbite-(Mn), 4 analyses corresponds to tantalite-(Mn) and 9 analyses corresponds to tantalite-(Fe).

References:

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

ⓘ Microcline

Formula: K(AlSi₃O₈)

References:

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

ⓘ Quartz

Formula: SiO₂

References:

ⓘ Spodumene

Formula: LiAlSi₂O₆

References:

Banerjee, D. C.; Krishna, K. V. G.; Murthy, G. V. G. K.; Srivastava, S. K.; Sinha, R. P. (1994) Occurrence of Spodumene in the Rare Metal-Bearing Pegmatites of Mariagalla-Allapatna Area, Mandya Dist., Karnataka. Journal Geological Society of India, 44 (2). 127-139 doi:10.17491/jgsi/1994/440203

ⓘ Tantalite-(Fe)

Formula: Fe²⁺Ta₂O₆

Description: Columbite-(Fe) is the dominant columbite-tantalite mineral at this locality, but 2 of 8 samples analysed by Sarbajna et al.(2000) show distinct tantalite-(Fe) zones.

References:

ⓘ Tantalite-(Mn)

Formula: Mn²⁺Ta₂O₆

Description: Columbite-(Fe) is the dominant columbite-tantalite mineral at this locality, but 2 of 8 samples analysed by Sarbajna et al.(2000) show distinct tantalite-(Mn) zones.

References:

ⓘ 'Tourmaline'

Formula: AD₃G₆(T₆O₁₈)(BO₃)₃X₃Z

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	Columbite-(Fe)	4.DB.35	Fe²⁺Nb₂O₆
ⓘ	Tantalite-(Fe)	4.DB.35	Fe²⁺Ta₂O₆
ⓘ	Columbite-(Mn)	4.DB.35	Mn²⁺Nb₂O₆
ⓘ	Tantalite-(Mn)	4.DB.35	Mn²⁺Ta₂O₆
Group 9 - Silicates
ⓘ	Beryl var. Alkali-beryl	9.CJ.05	Be₃Al₂(Si₆O₁₈)
ⓘ		9.CJ.05	Be₃Al₂(Si₆O₁₈)
ⓘ	Spodumene	9.DA.30	LiAlSi₂O₆
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)
ⓘ	Albite	9.FA.35	Na(AlSi₃O₈)
Unclassified
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Tourmaline'	-	AD₃G₆(T₆O₁₈)(BO₃)₃X₃Z
ⓘ	'Columbite-Tantalite'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Li	Lithium
Li	ⓘ Spodumene	LiAlSi₂O₆
Be	Beryllium
Be	ⓘ Beryl var. Alkali-beryl	Be₃Al₂(Si₆O₁₈)
Be	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
B	Boron
B	ⓘ Tourmaline	AD₃G₆(T₆O₁₈)(BO₃)₃X₃Z
O	Oxygen
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Beryl var. Alkali-beryl	Be₃Al₂(Si₆O₁₈)
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
O	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
O	ⓘ Tantalite-(Fe)	Fe²⁺Ta₂O₆
O	ⓘ Columbite-(Mn)	Mn²⁺Nb₂O₆
O	ⓘ Tantalite-(Mn)	Mn²⁺Ta₂O₆
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Quartz	SiO₂
O	ⓘ Spodumene	LiAlSi₂O₆
O	ⓘ Tourmaline	AD₃G₆(T₆O₁₈)(BO₃)₃X₃Z
F	Fluorine
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Na	Sodium
Na	ⓘ Albite	Na(AlSi₃O₈)
Mg	Magnesium
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	Aluminium
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Beryl var. Alkali-beryl	Be₃Al₂(Si₆O₁₈)
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Spodumene	LiAlSi₂O₆
Si	Silicon
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Beryl var. Alkali-beryl	Be₃Al₂(Si₆O₁₈)
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Beryl	Be₃Al₂(Si₆O₁₈)
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Spodumene	LiAlSi₂O₆
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
K	ⓘ Microcline	K(AlSi₃O₈)
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Ti	Titanium
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mn	Manganese
Mn	ⓘ Columbite-(Mn)	Mn²⁺Nb₂O₆
Mn	ⓘ Tantalite-(Mn)	Mn²⁺Ta₂O₆
Fe	Iron
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
Fe	ⓘ Tantalite-(Fe)	Fe²⁺Ta₂O₆
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Nb	Niobium
Nb	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
Nb	ⓘ Columbite-(Mn)	Mn²⁺Nb₂O₆
Ta	Tantalum
Ta	ⓘ Tantalite-(Fe)	Fe²⁺Ta₂O₆
Ta	ⓘ Tantalite-(Mn)	Mn²⁺Ta₂O₆

Other Regions, Features and Areas containing this locality

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Indian Plate (India Plate)Tectonic Plate

Western Dharwar CratonCraton

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Marlagalla-Allapatna, Mandya District, Karnataka, IndiaiRegional Level TypesMarlagalla-AllapatnaPegmatite Field Mandya DistrictDistrict KarnatakaState IndiaCountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Mineral List

Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

References

Marlagalla-Allapatna, Mandya District, Karnataka, India i
Regional Level Types
Marlagalla-Allapatna Pegmatite Field
Mandya District District
Karnataka State
India Country