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Aerinite () is a bluish-purple
inosilicate Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of Earth's crust. In mineralogy, the crystalline forms of silica (silicon dio ...
mineral. It crystallizes in the
monoclinic In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three Vector (geometric), vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in t ...
system and occurs as fibrous or compact masses and coatings. It has a dark, vitreous luster, a
specific gravity Relative density, also called specific gravity, is a dimensionless quantity defined as the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity for solids and liquids is nea ...
of 2.48 and a
Mohs hardness The Mohs scale ( ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fair ...
of 3. It is a low-temperature
hydrothermal Hydrothermal circulation in its most general sense is the circulation of hot water (Ancient Greek ὕδωρ, ''water'',Liddell, H.G. & Scott, R. (1940). ''A Greek-English Lexicon. revised and augmented throughout by Sir Henry Stuart Jones. with th ...
phase occurring in zeolite facies alteration of dolerites. Associated minerals include
prehnite Prehnite is an inosilicate of calcium and aluminium with the formula: Ca2Al(AlSi3O10)(OH)2 with limited Fe3+ substitutes for aluminium in the structure. Prehnite crystallizes in the orthorhombic crystal system, and most often forms as stalactitic ...
,
scolecite Scolecite is a tectosilicate mineral belonging to the zeolite group; it is a hydrated calcium silicate, Ca Al2 Si3 O10· 3H2O. Only minor amounts of sodium and traces of potassium substitute for calcium. There is an absence of barium, strontium, ...
and mesolite. Its name comes from a
Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...
root In vascular plants, the roots are the plant organ, organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. They are most often bel ...
"aerinos," meaning "atmosphere" or "sky blue". It was first described by Lasaulx (1876) from a specimen in the
Wrocław Wrocław is a city in southwestern Poland, and the capital of the Lower Silesian Voivodeship. It is the largest city and historical capital of the region of Silesia. It lies on the banks of the Oder River in the Silesian Lowlands of Central Eu ...
museum that was obtained in
Aragon Aragon ( , ; Spanish and ; ) is an autonomous communities of Spain, autonomous community in Spain, coextensive with the medieval Kingdom of Aragon. In northeastern Spain, the Aragonese autonomous community comprises three provinces of Spain, ...
, Spain. In 1882, the geologist Luis Mariano Vidal found the mineral
in situ is a Latin phrase meaning 'in place' or 'on site', derived from ' ('in') and ' ( ablative of ''situs'', ). The term typically refers to the examination or occurrence of a process within its original context, without relocation. The term is use ...
in Caserras del Castillo, a locality that currently belongs to the municipality of
Estopiñán del Castillo Estopiñán del Castillo (), in Ribagorçan: EstopanyàAs shown in ...
, in
Huesca Huesca (; ) is a city in north-eastern Spain, within the Autonomous communities of Spain, autonomous community of Aragon. It was the capital of the Kingdom of Aragon between 1096 and 1118. It is also the capital of the Spanish Huesca (province), ...
(Spain).


Deposits and uses

Aerinite is a rare mineral. It has been found in several deposits in the Spanish
Pyrenees The Pyrenees are a mountain range straddling the border of France and Spain. They extend nearly from their union with the Cantabrian Mountains to Cap de Creus on the Mediterranean coast, reaching a maximum elevation of at the peak of Aneto. ...
of Huesca and
Lleida Lleida (, ; ; '' see below'') is a city in the west of Catalonia, Spain. It is the capital and largest town in Segrià county, the Ponent region and the province of Lleida. Geographically, it is located in the Catalan Central Depression. It ...
, as in Estopiñán del Castillo,
Camporrélls Camporrélls () or Camporrells () is a municipality located in the province of Huesca, Aragon, Spain. According to the 2004 census ( INE), the municipality has a population of 231 inhabitants. See also * List of municipalities in Huesca This is ...
, Juseu and Tartareu. In France, the site is important from St. Pendelon, in the Landes. Aerinite was used as a blue pigment in Romanesque paintings in many churches in the Spain, and also in some French, including the most famous of them, the
Pantocrator In Christian iconography, Christ Pantocrator (, ) is a specific depiction of Christ. or , literally 'ruler of all', but usually translated as 'almighty' or 'all-powerful', is derived from one of many names of God in Judaism. The Pantokrator ...
in the church of San Clemente de Tahull.


See also

*
List of minerals This is a list of minerals which have Wikipedia articles. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various ''species''. Within a mineral speci ...


References

{{reflist Calcium minerals Iron minerals Magnesium minerals Inosilicates Carbonate minerals Trigonal minerals Minerals in space group 158