Gilalite is a copper

Copper

Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...

 silicate mineral with chemical composition of Cu₅Si₆O₁₇·7(H₂O).

It occurs as a retrograde metamorphic phase in a calc-silicate and sulfde skarn

Skarn

Skarn is an old Swedish mining term originally used to describe a type of silicate gangue, or waste rock, associated with iron-ore bearing sulfide deposits apparently replacing Archean age limestones in Sweden's Persberg mining district. In modern usage the term "skarn" has been expanded to refer...

 deposit. It occurs as fracture fillings and incrustations associated with diopside

Diopside

Diopside is a monoclinic pyroxene mineral with composition MgCaSi2O6. It forms complete solid solution series with hedenbergite and augite, and partial solid solutions with orthopyroxene and pigeonite. It forms variably colored, but typically dull green crystals in the monoclinic prismatic class...

 crystals. It is commonly found in the form of spherules of radial fibers.

It was first described for an occurrence in the Christmas porphyry copper mine in Gila County, Arizona

Gila County, Arizona

-2010:Whereas according to the 2010 U.S. Census Bureau:*76.8% White*0.4% Black*14.8% Native American*0.5% Asian*0.1% Native Hawaiian or Pacific Islander*2.0% Two or more races*5.4% Other races*17.9% Hispanic or Latino -2000:...

 in 1980 along with the mineral apachite

Apachite

Apachite is a copper silicate mineral with a general formula of Cu9Si10O29·11H2O. The name is associated with the Apache tribe residents of the area near the Christmas copper mine in the Dripping Spring Mountains of Gila County, Arizona, the location where apachite was first described in...

. It derives its name from this locality. It has also been reported from the Goodsprings District, Clark County, Nevada

Clark County, Nevada

-Demographics:As of the census of 2000, there were 1,375,765 people, 512,253 households, and 339,693 families residing within the MSA. The racial makeup of the MSA was 71.6% White , 9.1% Black, 5.7% Asian, 0.8% American Indian and 12.8% of other or mixed race. 22.0% were Hispanic of any race...

; Juazeiro do Norte

Juazeiro do Norte

Juazeiro do Norte is a city in the state of Ceará state in northeastern Brazil. It is located 528 km south of the state capital Fortaleza in the arid sertão...

, Ceara State, Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

 and a slag area in Lavrion District, Attica

Attica

Attica is a historical region of Greece, containing Athens, the current capital of Greece. The historical region is centered on the Attic peninsula, which projects into the Aegean Sea...

, Greece

Greece

Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....

.