A grandidierite-boralsilite bearing abyssal pegmatite in the Rogaland anorthosite complex intruded in high-grade granulites located about 2 km N of Moi. It occurs as a discordant, nearly vertical vein 10 m long and 10 cm wide hosted in pelitic rocks (gneises containing garnet, cordierite spinel, sillimanite) resulting from metamorphism under granulite-facies condition (Grew et al. 1998).

The host rocks:
Almandine migmatites (partially melted metapelites) within granulites at the contact of intrusive anorthosites (Bjerkrem-Sokndal layered lopolith) show hercynite-quartz and osumilite high-grade assemblages (750 °C-4 kb, up to 1050 °C at the anorthosite contact).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

16 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

ⓘ Almandine

Formula: Fe²⁺₃Al₂(SiO₄)₃

Description: Belongs to M2 assemblage (cf. Eur. J. Mineral. , 1991, 3, pp. 367-386). Late garnets rim hercynite-magnetite.

References:

Huijsmans, J.P.P., Barton, M., van Bergen, M.J. (1992) A pegmatite containing Fe-rich grandidierite, Ti-richdumortierite and tourmaline from the Precambrian, high-grade metamorphic complex of Rogaland, S-W.Norway. Neues Jahrbuch für Mineralogie - Abhandlungen, 143 (3) 249-261

ⓘ Andalusite

Formula: Al₂(SiO₄)O

References:

Grew, Edward S., McGee, James J., Yates, Martin G., Peacor, Donald R., Rouse, Roland C., Huijsmanns, Joep P. P., Shearer, Charles K., Wiedenbeck, Michael, Thost, Douglas E., Su, Shu-Chun (1998) Boralsilite (Al₁₆B₆Si₂O₃₇); a new mineral related to sillimanite from pegmatites in granulite-facies rocks. American Mineralogist, 83 (5) 638-651 doi:10.2138/am-1998-5-624

ⓘ Boralsilite (TL)

Formula: Al₁₆B₆O₃₀(Si₂O₇)

Type Locality:

Colour: Colorless

Description: Occurs as a) in parallell growth with grandidierite b) aggregated prisms 0,05 -0,2mm wide with a rhombic cross section c)bundles and sheaves of intergrown borasilite and werdingite. (Grew et al 1998)

References:

Grew, E. S. et al. (1998): Boralsilite (Al 16 B 6 Si 2 O 37 )

ⓘ 'Chlorite Group'

References:

ⓘ Cordierite

Formula: (Mg,Fe)₂Al₃(AlSi₅O₁₈)

Description: Replaces M2 assemblage. Cordierite is absent in the pegmatite.

References:

phase relations, and implications for crustal processes. European Journal of Mineralogy 3: 367-386

Waters, D. J. (1991): Hercynite-quartz granulites

ⓘ Corundum

Formula: Al₂O₃

Colour: blue, colorless

References:

ⓘ Dumortierite

Formula: Al(Al₂O)(Al₂O)₂(SiO₄)₃(BO₃)

Colour: Rose (Ti-rich): Blue to purple

Description: Ti-poor and High Ti-rich dumortierites. - The blue and purple variety as > 2 mm large grains closely associated with borasilite, and as prisms 1 cm in length. - Rose coloured Ti-rich variety as grains and aggregates up to 6mm across.

References:

ⓘ Enstatite

Formula: Mg₂Si₂O₆

References:

phase relations, and implications for crustal processes. European Journal of Mineralogy 3: 367-386

Waters, D. J. (1991): Hercynite-quartz granulites

ⓘ Grandidierite

Formula: (Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂

Habit: prisms up to 1,5 cm long & 0,5 cm across; coarse and finegrained grains

Colour: deep blue-green

Description: Belongs to M2 assemblage (cf. Eur. J. Mineral. , 1991, 3, pp. 367-386). Ferroan (Fe/(Fe+Mg)= 0,50-0,67.

References:

Grew, Edward S., Yates, Martin G., Huijsmans, Joep P. P., McGee, James J., Shearer, Charles K., Wiedenbeck, Michael, Rouse, Roland C. (1998) Werdingite, a borosilicate new to granitic pegmatites. The Canadian Mineralogist, 36 (2) 399-414

ⓘ Hercynite

Formula: Fe²⁺Al₂O₄

Description: Hercynite-quartz high-grade assemblages (Belongs to M2 assemblage)(cf. Eur. J. Mineral. , 1991, 3, pp. 367-386). Replaces sillimanite and envelopped by cordierite or plagioclase. Composite grains with magnetite, surrounded by cordierite or enclosed within osumilite.

References:

ⓘ 'K Feldspar'

Description: Belongs to M2 assemblage (cf. Eur. J. Mineral. , 1991, 3, pp. 367-386).

References:

ⓘ 'Leucoxene'

References:

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

Description: Belongs to M2 assemblage (cf. Eur. J. Mineral. , 1991, 3, pp. 367-386).

References:

phase relations, and implications for crustal processes. European Journal of Mineralogy 3: 367-386

Waters, D. J. (1991): Hercynite-quartz granulites

ⓘ 'Monazite'

Formula: REE(PO₄)

References:

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

ⓘ Ominelite

Formula: (Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂

References:

Hiroi, Yoshikuni, Grew, Edward S., Motoyoshi, Yoichi, Peacor, Donald R., Rouse, Roland C., Matsubara, Satoshi, Yokoyama, Kazumi, Miyawaki, Ritsuro, Mcgee, James J., Su, Shu-Chun, Hokada, Tomokazu, Furukawa, Noboru, Shibasaki, Hiroshi (2002) Ominelite, (Fe,Mg)Al₃BSiO₉ (Fe2+analogue of grandidierite), a new mineral from porphyritic granite in Japan. American Mineralogist, 87 (1) 160-170 doi:10.2138/am-2002-0117

Kristiansen, Roy (2007) Originalbeskrevne mineraler fra Norge in i ett nytt årtusen. STEIN. Nordisk magasin for populær geologi, 34 (1) 31-34

ⓘ Osumilite-(Mg)

Formula: K◻₂Mg₂Al₃[Al₂Si₁₀O₃₀]

Description: Belongs to M2 assemblage (cf. Eur. J. Mineral. , 1991, 3, pp. 367-386).

References:

phase relations, and implications for crustal processes. European Journal of Mineralogy 3: 367-386

Waters, D. J. (1991): Hercynite-quartz granulites

ⓘ 'Plagioclase'

Formula: (Na,Ca)[(Si,Al)AlSi₂]O₈

Description: Belongs to M2 assemblage and overgrowths on M2 assemblage (cf. Eur. J. Mineral. , 1991, 3, pp. 367-386).

References:

ⓘ Quartz

Formula: SiO₂

Description: Belongs to M2 assemblage (cf. Eur. J. Mineral. , 1991, 3, pp. 367-386).

References:

ⓘ Sillimanite

Formula: Al₂(SiO₄)O

Habit: Fibrous sprays

References:

ⓘ 'Tourmaline'

Formula: AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z

Colour: black

References:

ⓘ 'UM1998-//-BOSiO:AlFeMg[2]'

Formula: (Fe²⁺,Mg)₂Al₁₄Si₄B₄O₃₇

Habit: 2-3 mm long bundles of subparallell or somewhat radiating prisms

Description: As open clusters of prisms or as intergrowth with grandidierite

References:

ⓘ Werdingite

Formula: (Mg,Fe)₂Al₁₄Si₄B₄O₃₇

Habit: bundles of 2-3 mm long subparallell or radiating prisms

Description: Fe-werdingite, associated with grandidierite and Ti-poor dumortierite. 600-700°C, 3-4 kb. It occurs commonly intergrown with grandidierite

References:

ⓘ 'Wolframite Group'

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Hercynite	4.BB.05	Fe²⁺Al₂O₄
ⓘ	Corundum	4.CB.05	Al₂O₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	'Wolframite Group'	4.DB.30 va
Group 9 - Silicates
ⓘ	Almandine	9.AD.25	Fe²⁺₃Al₂(SiO₄)₃
ⓘ	Sillimanite	9.AF.05	Al₂(SiO₄)O
ⓘ	Andalusite	9.AF.10	Al₂(SiO₄)O
ⓘ	Ominelite	9.AJ.05	(Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
ⓘ	Grandidierite	9.AJ.05	(Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
ⓘ	Dumortierite	9.AJ.10	Al(Al₂O)(Al₂O)₂(SiO₄)₃(BO₃)
ⓘ	Boralsilite (TL)	9.BD.30	Al₁₆B₆O₃₀(Si₂O₇)
ⓘ	Werdingite	9.BD.35	(Mg,Fe)₂Al₁₄Si₄B₄O₃₇
ⓘ	Cordierite	9.CJ.10	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
ⓘ	Osumilite-(Mg)	9.CM.05	K◻₂Mg₂Al₃[Al₂Si₁₀O₃₀]
ⓘ	Enstatite	9.DA.05	Mg₂Si₂O₆
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
Unclassified
ⓘ	'Monazite'	-	REE(PO₄)
ⓘ	'Chlorite Group'	-
ⓘ	'Tourmaline'	-	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
ⓘ	'Leucoxene'	-
ⓘ	'UM1998-//-BOSiO:AlFeMg[2]'	-	(Fe²⁺,Mg)₂Al₁₄Si₄B₄O₃₇
ⓘ	'Plagioclase'	-	(Na,Ca)[(Si,Al)AlSi₂]O₈
ⓘ	'K Feldspar'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
B	Boron
B	ⓘ Dumortierite	Al(Al₂O)(Al₂O)₂(SiO₄)₃(BO₃)
B	ⓘ Grandidierite	(Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
B	ⓘ Tourmaline	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
B	ⓘ Werdingite	(Mg,Fe)₂Al₁₄Si₄B₄O₃₇
B	ⓘ Boralsilite	Al₁₆B₆O₃₀(Si₂O₇)
B	ⓘ UM1998-//-BOSiO:AlFeMg[2]	(Fe²⁺,Mg)₂Al₁₄Si₄B₄O₃₇
B	ⓘ Ominelite	(Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
O	Oxygen
O	ⓘ Andalusite	Al₂(SiO₄)O
O	ⓘ Almandine	Fe₃²⁺Al₂(SiO₄)₃
O	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
O	ⓘ Corundum	Al₂O₃
O	ⓘ Dumortierite	Al(Al₂O)(Al₂O)₂(SiO₄)₃(BO₃)
O	ⓘ Enstatite	Mg₂Si₂O₆
O	ⓘ Grandidierite	(Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
O	ⓘ Hercynite	Fe²⁺Al₂O₄
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Monazite	REE(PO₄)
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Osumilite-(Mg)	K◻₂Mg₂Al₃[Al₂Si₁₀O₃₀]
O	ⓘ Quartz	SiO₂
O	ⓘ Sillimanite	Al₂(SiO₄)O
O	ⓘ Tourmaline	AD₃G₆ (T₆O₁₈)(BO₃)₃X₃Z
O	ⓘ Werdingite	(Mg,Fe)₂Al₁₄Si₄B₄O₃₇
O	ⓘ Boralsilite	Al₁₆B₆O₃₀(Si₂O₇)
O	ⓘ UM1998-//-BOSiO:AlFeMg[2]	(Fe²⁺,Mg)₂Al₁₄Si₄B₄O₃₇
O	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
O	ⓘ Ominelite	(Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
Na	Sodium
Na	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Mg	Magnesium
Mg	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
Mg	ⓘ Enstatite	Mg₂Si₂O₆
Mg	ⓘ Grandidierite	(Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
Mg	ⓘ Osumilite-(Mg)	K◻₂Mg₂Al₃[Al₂Si₁₀O₃₀]
Mg	ⓘ Werdingite	(Mg,Fe)₂Al₁₄Si₄B₄O₃₇
Mg	ⓘ UM1998-//-BOSiO:AlFeMg[2]	(Fe²⁺,Mg)₂Al₁₄Si₄B₄O₃₇
Mg	ⓘ Ominelite	(Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
Al	Aluminium
Al	ⓘ Andalusite	Al₂(SiO₄)O
Al	ⓘ Almandine	Fe₃²⁺Al₂(SiO₄)₃
Al	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
Al	ⓘ Corundum	Al₂O₃
Al	ⓘ Dumortierite	Al(Al₂O)(Al₂O)₂(SiO₄)₃(BO₃)
Al	ⓘ Grandidierite	(Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
Al	ⓘ Hercynite	Fe²⁺Al₂O₄
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Osumilite-(Mg)	K◻₂Mg₂Al₃[Al₂Si₁₀O₃₀]
Al	ⓘ Sillimanite	Al₂(SiO₄)O
Al	ⓘ Werdingite	(Mg,Fe)₂Al₁₄Si₄B₄O₃₇
Al	ⓘ Boralsilite	Al₁₆B₆O₃₀(Si₂O₇)
Al	ⓘ UM1998-//-BOSiO:AlFeMg[2]	(Fe²⁺,Mg)₂Al₁₄Si₄B₄O₃₇
Al	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Al	ⓘ Ominelite	(Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
Si	Silicon
Si	ⓘ Andalusite	Al₂(SiO₄)O
Si	ⓘ Almandine	Fe₃²⁺Al₂(SiO₄)₃
Si	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
Si	ⓘ Dumortierite	Al(Al₂O)(Al₂O)₂(SiO₄)₃(BO₃)
Si	ⓘ Enstatite	Mg₂Si₂O₆
Si	ⓘ Grandidierite	(Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Osumilite-(Mg)	K◻₂Mg₂Al₃[Al₂Si₁₀O₃₀]
Si	ⓘ Quartz	SiO₂
Si	ⓘ Sillimanite	Al₂(SiO₄)O
Si	ⓘ Werdingite	(Mg,Fe)₂Al₁₄Si₄B₄O₃₇
Si	ⓘ Boralsilite	Al₁₆B₆O₃₀(Si₂O₇)
Si	ⓘ UM1998-//-BOSiO:AlFeMg[2]	(Fe²⁺,Mg)₂Al₁₄Si₄B₄O₃₇
Si	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Si	ⓘ Ominelite	(Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
P	Phosphorus
P	ⓘ Monazite	REE(PO₄)
K	Potassium
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
K	ⓘ Osumilite-(Mg)	K◻₂Mg₂Al₃[Al₂Si₁₀O₃₀]
Ca	Calcium
Ca	ⓘ Plagioclase	(Na,Ca)[(Si,Al)AlSi₂]O₈
Fe	Iron
Fe	ⓘ Almandine	Fe₃²⁺Al₂(SiO₄)₃
Fe	ⓘ Cordierite	(Mg,Fe)₂Al₃(AlSi₅O₁₈)
Fe	ⓘ Grandidierite	(Mg,Fe²⁺)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂
Fe	ⓘ Hercynite	Fe²⁺Al₂O₄
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Werdingite	(Mg,Fe)₂Al₁₄Si₄B₄O₃₇
Fe	ⓘ UM1998-//-BOSiO:AlFeMg[2]	(Fe²⁺,Mg)₂Al₁₄Si₄B₄O₃₇
Fe	ⓘ Ominelite	(Fe²⁺,Mg)(Al,Fe³⁺)₃(SiO₄)(BO₃)O₂

Other Regions, Features and Areas containing this locality

Baltic Shield (Fennoscandian Shield)Shield

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References

Huijsmans, J.P.P. (1981) A grandidierite bearing pegmatite from the Almgjotheii, Rogaland, SW Norway. M.Sc. thesis (Petrology), Inst. of Earth Sciences, State University of Utrecht, The Netherlands (in Dutch).

Waters, D. J. (1991): Hercynite-quartz granulites; phase relations, and implications for crustal processes. European Journal of Mineralogy 3: 367-386.

Grew, E. S. (1998) Boron and beryllium minerals in granulite-facies pegmatites and implications of beryllium pegmatites for the origin and evolution of the Archean Napier Complex of East Antarctica. Memoirs of the National Institute of Polar Research, Special Issue, 53. 74-92

Kristiansen, Roy (2000) Borasilite-Al16B6Si2O37-et nytt mineral fra Antarktis og Norge. STEIN. Magasin for populærgeologi, 27 (1) 33

Kristiansen, R. (2012): Almgjotheii-en sjelden borosilikatpegmatitt i Rogaland. Norsk Bergverksmuseum Skrifter. 49, 81-92

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Almgjotheii, Flatestøl, Lund, Rogaland, NorwayiRegional Level TypesAlmgjotheiiOutcrop FlatestølFarm LundMunicipality RogalandCounty NorwayCountry 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

Almgjotheii, Flatestøl, Lund, Rogaland, Norway i
Regional Level Types
Almgjotheii Outcrop
Flatestøl Farm
Lund Municipality
Rogaland County
Norway Country