Naegi district (Naegi pegmatite district), Nakatsugawa City, Gifu Prefecture, Japani
Regional Level Types | |
---|---|
Naegi district (Naegi pegmatite district) | District |
Nakatsugawa City | City |
Gifu Prefecture | Prefecture |
Japan | Country |
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Latitude & Longitude (WGS84):
35° North , 137° East (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~28km
Type:
KΓΆppen climate type:
Mindat Locality ID:
108134
Long-form identifier:
mindat:1:2:108134:6
GUID (UUID V4):
5ff55951-3211-4e96-9ef3-14dfff12574b
A large area of granite quarries with miarolitic cavities, granitic pegmatites and pneumatolytic veins, mostly now within the administrative boundaries of Nakatsugawa City. "Naegi district" and "Naegi pegmatite district" is used as a geological area name and is not a political hierarchy (ie. NOT limited only to pegmatites in the old Naegi village).
This extensive area of pegmatites and related rocks is not limited just to those around the old Naegi village (now absorbed into Nakatsugawa city) but also extended through the villages of Fukuoka and Hirukawa in the old Ena district (likewise now absorbed into Nakatsugawa city) as well as parts of Ena City and Shirakawa village and even extending a bit across the border into neighboring Nagano prefecture (eg: the Tadachi pegmatite).
The Naegi Pegmatite District in the Hirukawa area of Gifu Prefecture is one of the classic mineral localities of Japan. Historically, this area produced some Japanβs finest topaz crystals. Tsunashiro Wada wrote in his 1904 book Minerals of Japan (Nihon Kobutsushi) that βAmong the best known minerals from Japan are stibnite, in crystals most gigantic and splendid of all metallic minerals, topaz [from the Naegi District and Tanakamiyama]β¦, and rock crystal which presents an uncommon form of twinning [Japan law twins].β More recently the district includes type locations for the minerals hingganite-(Ce) and proto-ferro anthophyllite.
Mining in the area started in the latter half of the 19th century with the development of alluvial (placer) deposits that concentrated resistant minerals that had weathered from the granites and related hydrothermal veins. Later, in the 20th century, with growing interest in western building styles, quarrying of the local granite for building stone began. This exposed many pegmatites which are the main source of mineral specimens from the area. Polymetallic vein deposits that are also associated with the granites and are hosted by it and surrounding lithologies. Many of these have been mined for ores of molybdenum, tungsten, tin, bismuth, copper, lead and zinc.
During the Edo period Nakatsugawa was a post town (station) along the Nakasendo, an important travel route that stretched through the central mountains of Honshu from Edo (modern-day Tokyo) to Kyoto. Although heavily traveled, and farmed for more than a millennia, there seems to have been no mineral development in this area prior to the Meiji Restoration.
The dominant specimen producing lithologies in the Naegi District are miarolitic pegmatites of the NYF family, found throughout the Naegi-Agematsu granite, and related pneumatolytic hydrothermal veins that crosscut the granite and the Nohi rhyolite.
As with most NYF family pegmatites, the dominant mineralogy of the Naegi District pegmatites is quite simple comprising beautiful crystals of smoky quartz, microcline (of a great variety of forms and twins), albite, muscovite, biotite, zinnwaldite, schorl, fluorite, beryl and most notably topaz. There are also accessory minerals, usually found in microcrystals. These include zeolites such as chabazite-Ca and stilbite-Ca, cassiterite, molybdenite and a suite of REE and actinide bearing minerals such as zircon, hingganite-(Ce), fergusonite-(Y), samarskite-(Y), monazite-(Ce), allanite-(Ce), xenotime-(Y) and gadolinite-(Y).
Mining in the area started in the latter half of the 19th century with the development of alluvial (placer) deposits that concentrated resistant minerals that had weathered from the granites and related hydrothermal veins. Later, in the 20th century, with growing interest in western building styles, quarrying of the local granite for building stone began. This exposed many pegmatites which are the main source of mineral specimens from the area. Polymetallic vein deposits that are also associated with the granites and are hosted by it and surrounding lithologies. Many of these have been mined for ores of molybdenum, tungsten, tin, bismuth, copper, lead and zinc.
During the Edo period Nakatsugawa was a post town (station) along the Nakasendo, an important travel route that stretched through the central mountains of Honshu from Edo (modern-day Tokyo) to Kyoto. Although heavily traveled, and farmed for more than a millennia, there seems to have been no mineral development in this area prior to the Meiji Restoration.
The dominant specimen producing lithologies in the Naegi District are miarolitic pegmatites of the NYF family, found throughout the Naegi-Agematsu granite, and related pneumatolytic hydrothermal veins that crosscut the granite and the Nohi rhyolite.
As with most NYF family pegmatites, the dominant mineralogy of the Naegi District pegmatites is quite simple comprising beautiful crystals of smoky quartz, microcline (of a great variety of forms and twins), albite, muscovite, biotite, zinnwaldite, schorl, fluorite, beryl and most notably topaz. There are also accessory minerals, usually found in microcrystals. These include zeolites such as chabazite-Ca and stilbite-Ca, cassiterite, molybdenite and a suite of REE and actinide bearing minerals such as zircon, hingganite-(Ce), fergusonite-(Y), samarskite-(Y), monazite-(Ce), allanite-(Ce), xenotime-(Y) and gadolinite-(Y).
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Mineral list contains entries from the region specified including sub-localities35 valid minerals.
Rock Types Recorded
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Alphabetical List Tree DiagramDetailed Mineral List:
β 'Agardite' |
β Albite Formula: Na(AlSi3O8) Localities: References: |
β Allanite-(Ce) Formula: (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
β Arsenopyrite Formula: FeAsS |
β Beryl Formula: Be3Al2(Si6O18) References: |
β 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
β Calcite Formula: CaCO3 |
β Cassiterite Formula: SnO2 Localities: References: |
β 'Chabazite' References: |
β Chabazite-Ca Formula: (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
β Chalcopyrite Formula: CuFeS2 |
β 'Chlorite Group' |
β Covellite Formula: CuS |
β Cuprite Formula: Cu2O |
β Digenite Formula: Cu9S5 |
β Duftite Formula: PbCu(AsO4)(OH) |
β 'Feldspar Group' |
β 'Fergusonite' |
β Fergusonite-(Y) Formula: YNbO4 |
β Fluorite Formula: CaF2 |
β Gadolinite-(Y) Formula: Y2Fe2+Be2Si2O10 |
β Galena Formula: PbS |
β Goethite Formula: Ξ±-Fe3+O(OH) |
β Hingganite-(Ce) Formula: (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
β 'Limonite' |
β Malachite Formula: Cu2(CO3)(OH)2 |
β Microcline Formula: K(AlSi3O8) References: |
β Molybdenite Formula: MoS2 |
β Monazite-(Ce) Formula: Ce(PO4) |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 Localities: |
β Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
β Orthoclase Formula: K(AlSi3O8) |
β Pyrite Formula: FeS2 |
β Pyrrhotite Formula: Fe1-xS |
β Quartz Formula: SiO2 |
β Quartz var. Smoky Quartz Formula: SiO2 |
β Samarskite-(Y) Formula: YFe3+Nb2O8 |
β Schorl Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
β Sphalerite Formula: ZnS |
β Stannite Formula: Cu2FeSnS4 |
β Stilbite-Ca Formula: NaCa4(Si27Al9)O72 · 28H2O |
β Topaz Formula: Al2(SiO4)(F,OH)2 Localities: References: |
β Xenotime-(Y) Formula: Y(PO4) |
β 'Zinnwaldite' |
β Zircon Formula: Zr(SiO4) References: |
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Digenite | 2.BA.10 | Cu9S5 |
β | Covellite | 2.CA.05a | CuS |
β | Sphalerite | 2.CB.05a | ZnS |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Stannite | 2.CB.15a | Cu2FeSnS4 |
β | Pyrrhotite | 2.CC.10 | Fe1-xS |
β | Galena | 2.CD.10 | PbS |
β | Molybdenite | 2.EA.30 | MoS2 |
β | Pyrite | 2.EB.05a | FeS2 |
β | Arsenopyrite | 2.EB.20 | FeAsS |
Group 3 - Halides | |||
β | Fluorite | 3.AB.25 | CaF2 |
Group 4 - Oxides and Hydroxides | |||
β | Goethite | 4.00. | Ξ±-Fe3+O(OH) |
β | Cuprite | 4.AA.10 | Cu2O |
β | Quartz var. Smoky Quartz | 4.DA.05 | SiO2 |
β | 4.DA.05 | SiO2 | |
β | Cassiterite | 4.DB.05 | SnO2 |
β | Samarskite-(Y) | 4.DB.25 | YFe3+Nb2O8 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
β | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Fergusonite-(Y) | 7.GA.05 | YNbO4 |
Group 8 - Phosphates, Arsenates and Vanadates | |||
β | Xenotime-(Y) | 8.AD.35 | Y(PO4) |
β | Monazite-(Ce) | 8.AD.50 | Ce(PO4) |
β | Duftite | 8.BH.35 | PbCu(AsO4)(OH) |
Group 9 - Silicates | |||
β | Zircon | 9.AD.30 | Zr(SiO4) |
β | Topaz | 9.AF.35 | Al2(SiO4)(F,OH)2 |
β | Hingganite-(Ce) | 9.AJ.20 | (Ce,REE)2(β»,Fe2+)Be2[SiO4]2(OH)2 |
β | Gadolinite-(Y) | 9.AJ.20 | Y2Fe2+Be2Si2O10 |
β | Allanite-(Ce) | 9.BG.05b | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
β | Beryl | 9.CJ.05 | Be3Al2(Si6O18) |
β | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | Microcline | 9.FA.30 | K(AlSi3O8) |
β | Orthoclase | 9.FA.30 | K(AlSi3O8) |
β | Albite | 9.FA.35 | Na(AlSi3O8) |
β | Chabazite-Ca | 9.GD.10 | (Ca,K2,Na2)2[Al2Si4O12]2 Β· 12H2O |
β | Stilbite-Ca | 9.GE.10 | NaCa4(Si27Al9)O72 Β· 28H2O |
Unclassified | |||
β | 'Agardite' | - | |
β | 'Limonite' | - | |
β | 'Zinnwaldite' | - | |
β | 'Feldspar Group' | - | |
β | 'Chlorite Group' | - | |
β | 'Chabazite' | - | |
β | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
β | 'Fergusonite' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
H | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
H | β Duftite | PbCu(AsO4)(OH) |
H | β Goethite | Ξ±-Fe3+O(OH) |
H | β Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
H | β Malachite | Cu2(CO3)(OH)2 |
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
H | β Topaz | Al2(SiO4)(F,OH)2 |
H | β Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
H | β Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
H | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Be | Beryllium | |
Be | β Beryl | Be3Al2(Si6O18) |
Be | β Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
Be | β Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
B | Boron | |
B | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
C | Carbon | |
C | β Calcite | CaCO3 |
C | β Malachite | Cu2(CO3)(OH)2 |
O | Oxygen | |
O | β Albite | Na(AlSi3O8) |
O | β Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
O | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
O | β Beryl | Be3Al2(Si6O18) |
O | β Calcite | CaCO3 |
O | β Cassiterite | SnO2 |
O | β Cuprite | Cu2O |
O | β Duftite | PbCu(AsO4)(OH) |
O | β Fergusonite-(Y) | YNbO4 |
O | β Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
O | β Goethite | Ξ±-Fe3+O(OH) |
O | β Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
O | β Malachite | Cu2(CO3)(OH)2 |
O | β Microcline | K(AlSi3O8) |
O | β Monazite-(Ce) | Ce(PO4) |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Orthoclase | K(AlSi3O8) |
O | β Quartz | SiO2 |
O | β Samarskite-(Y) | YFe3+Nb2O8 |
O | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
O | β Quartz var. Smoky Quartz | SiO2 |
O | β Topaz | Al2(SiO4)(F,OH)2 |
O | β Xenotime-(Y) | Y(PO4) |
O | β Zircon | Zr(SiO4) |
O | β Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
O | β Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
O | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
F | Fluorine | |
F | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
F | β Fluorite | CaF2 |
F | β Topaz | Al2(SiO4)(F,OH)2 |
Na | Sodium | |
Na | β Albite | Na(AlSi3O8) |
Na | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
Na | β Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
Na | β Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
Mg | Magnesium | |
Mg | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Al | Aluminium | |
Al | β Albite | Na(AlSi3O8) |
Al | β Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
Al | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Al | β Beryl | Be3Al2(Si6O18) |
Al | β Microcline | K(AlSi3O8) |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Orthoclase | K(AlSi3O8) |
Al | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
Al | β Topaz | Al2(SiO4)(F,OH)2 |
Al | β Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
Al | β Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
Al | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | β Albite | Na(AlSi3O8) |
Si | β Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
Si | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Si | β Beryl | Be3Al2(Si6O18) |
Si | β Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
Si | β Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
Si | β Microcline | K(AlSi3O8) |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Orthoclase | K(AlSi3O8) |
Si | β Quartz | SiO2 |
Si | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
Si | β Quartz var. Smoky Quartz | SiO2 |
Si | β Topaz | Al2(SiO4)(F,OH)2 |
Si | β Zircon | Zr(SiO4) |
Si | β Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
Si | β Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
Si | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
P | Phosphorus | |
P | β Monazite-(Ce) | Ce(PO4) |
P | β Xenotime-(Y) | Y(PO4) |
S | Sulfur | |
S | β Arsenopyrite | FeAsS |
S | β Chalcopyrite | CuFeS2 |
S | β Covellite | CuS |
S | β Digenite | Cu9S5 |
S | β Galena | PbS |
S | β Molybdenite | MoS2 |
S | β Pyrite | FeS2 |
S | β Pyrrhotite | Fe1-xS |
S | β Sphalerite | ZnS |
S | β Stannite | Cu2FeSnS4 |
K | Potassium | |
K | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
K | β Microcline | K(AlSi3O8) |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Orthoclase | K(AlSi3O8) |
K | β Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
K | β Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | β Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
Ca | β Calcite | CaCO3 |
Ca | β Fluorite | CaF2 |
Ca | β Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
Ca | β Stilbite-Ca | NaCa4(Si27Al9)O72 · 28H2O |
Ti | Titanium | |
Ti | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | Iron | |
Fe | β Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
Fe | β Arsenopyrite | FeAsS |
Fe | β Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
Fe | β Goethite | Ξ±-Fe3+O(OH) |
Fe | β Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
Fe | β Pyrite | FeS2 |
Fe | β Pyrrhotite | Fe1-xS |
Fe | β Samarskite-(Y) | YFe3+Nb2O8 |
Fe | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
Fe | β Stannite | Cu2FeSnS4 |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Cu | β Covellite | CuS |
Cu | β Cuprite | Cu2O |
Cu | β Digenite | Cu9S5 |
Cu | β Duftite | PbCu(AsO4)(OH) |
Cu | β Malachite | Cu2(CO3)(OH)2 |
Cu | β Stannite | Cu2FeSnS4 |
Zn | Zinc | |
Zn | β Sphalerite | ZnS |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
As | β Duftite | PbCu(AsO4)(OH) |
Y | Yttrium | |
Y | β Fergusonite-(Y) | YNbO4 |
Y | β Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
Y | β Samarskite-(Y) | YFe3+Nb2O8 |
Y | β Xenotime-(Y) | Y(PO4) |
Zr | Zirconium | |
Zr | β Zircon | Zr(SiO4) |
Nb | Niobium | |
Nb | β Fergusonite-(Y) | YNbO4 |
Nb | β Samarskite-(Y) | YFe3+Nb2O8 |
Mo | Molybdenum | |
Mo | β Molybdenite | MoS2 |
Sn | Tin | |
Sn | β Cassiterite | SnO2 |
Sn | β Stannite | Cu2FeSnS4 |
Ce | Cerium | |
Ce | β Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
Ce | β Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
Ce | β Monazite-(Ce) | Ce(PO4) |
Pb | Lead | |
Pb | β Duftite | PbCu(AsO4)(OH) |
Pb | β Galena | PbS |
Localities in this Region
- Gifu Prefecture
- Nakatsugawa City
- Naegi district (Naegi pegmatite district)
- Nakatsugawa City
Other Regions, Features and Areas containing this locality
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Naegi district, Nakatsugawa City, Gifu Prefecture, Japan