Essexite
A rock subtype
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Name:
Its name is derived from Essex County, Massachusetts, USA.
A nepheline monzogabbro or nepheline monzodiorite.
An variety of alkali gabbro primarily composed of plagioclase, hornblende, biotite, and titanaugite, with lesser amounts of Potassium feldspar and nepheline. Essexite grades into theralite with a decrease in potassium feldspar and an increase in nepheline and other feldspathoid minerals.
An variety of alkali gabbro primarily composed of plagioclase, hornblende, biotite, and titanaugite, with lesser amounts of Potassium feldspar and nepheline. Essexite grades into theralite with a decrease in potassium feldspar and an increase in nepheline and other feldspathoid minerals.
Unique Identifiers
Mindat ID:
48309
Long-form identifier:
mindat:1:1:48309:6
Classification of Essexite
Sub-divisions of Essexite
Mineralogy of Essexite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Alkali Feldspar > K Feldspar | Potassium-dominant feldspars with variable crystal symmetry and Al-Si ordering state; they are a subgroup of ... |
| Feldspathoid > Nepheline | Na3K(Al4Si4O16) |
| Mafic minerals | A petrological term for dark, rock-forming minerals rich in magnesium and/or iron. |
| Sodic plagioclase | A petrological term for plagioclase feldspars dominant in sodium. |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole > Hornblende | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Pronunciation of Essexite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Internet Links for Essexite
mindat.org URL:
https://www.mindat.org/min-48309.html
Please feel free to link to this page.
Please feel free to link to this page.
References for Essexite
Localities for Essexite
Showing 46 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Algeria | |
| Remy (Sahara Central) +2 other references |
Angola | |
| Andrade (note preliminaire) +2 other references |
| Andrade (note preliminaire) +2 other references | |
| Lapido-Loureiro +2 other references |
Antarctica | |
| Gair (1967) +1 other reference |
| Kyle et al. (1976) +2 other references | |
Armenia | |
| Hovakimyan et al. (2019) |
Australia | |
| Brown (1930) |
Brazil | |
| doi.org/10.1007/BF00302491 +6 other references |
| Smith et al. (1933) +9 other references |
Bulgaria | |
| Marinov +3 other references |
Cape Verde | |
| Shaw et al. (2006) +3 other references |
| Stillman et al. (1982) +5 other references |
| Silva (Cape Verde Republic) +9 other references | |
China | |
| Zhang et al. (Eds.) |
Czech Republic | |
| Kopecky (1966) +5 other references |
| Ulrych et al. (with emphasis on the Roztoky, Osečná and Dvůr Králové centres) +12 other references |
| Ulrych et al. (1983) +11 other references |
Egypt | |
| Akaad et al. (South-eastern desert of Egypt) +10 other references |
| El Ramly +4 other references | |
| El Ramly et al. (1969) +4 other references | |
France | |
| Mcbirney et al. (1968) +2 other references |
| Brousse +8 other references |
Germany | |
| Spürgin et al. (2019) |
| media.lgrb-bw.de (n.d.) |
Guinea | |
| Gerasimovskii et al. (Guinea) +7 other references |
India | |
| Subrahmanyam et al. (1991) |
Israel | |
| Bentor (1952) +9 other references |
Kenya | |
| Smith (1938) +3 other references |
Kyrgyzstan | |
| Vrublevskii (2017, December) +1 other reference |
Madagascar | |
| Lacroix (1922) +2 other references |
Mongolia | |
| Pavlenko (1974) |
| Pavlenko (1974) |
| Pavlenko (1974) | |
| Pavlenko (1974) | |
Namibia | |
| Simpson +5 other references |
Norway | |
| Heldal +29 other references | |
Portugal | |
| Czygan +8 other references |
| Gagel +11 other references | |
| Alves (n.d.) +7 other references |
Russia | |
| alkcarb.myrocks.info (n.d.) |
| Liferovich et al. (2006) +3 other references |
| Trunilina et al. (2022) |
Saint Helena， Ascension and Tristan da Cunha | |
| Campbell (1915) | |
Ukraine | |
| Ryabchikov et al. (2008) |
Uzbekistan | |
| Volkov et al. (1999) |
