Detail of rare #Cylindrite from Poopo, Bolivia.

FOV 3 cm

#MinCup26 #MinCup #mineral #mineralogy #crystal #mineralexpert

There is just too much to say about #Calcite and its numerous varieties - just check our comprehensive overview:

#MinCup26 #MinCup #mineral #crystal #mineralogy #carbonate #mineralexpert

mineralexpert.org/article/calc...

Monster size faceted #Calcite from Brazil - 1800 ct!!!

Calcite is very difficult to facet due to its perfect cleavage and very low hardness.

#MinCup26 #MinCup #mineral #crystal #mineralogy #carbonate #mineralexpert

Clear #Gypsum crystals on #Alabaster (fine grained gypsum variety) matrix from Fuentes de Ebro, Zaragoza, Spain.

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert

Cluster of bright green #Pyromorphite crystals from San Andres Mine, Spain.

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert

Classic bright green #Pyromorphite specimen from Daoping Mine, Guilin Prefecture, China.

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert

Nice #Axinite crystal cluster from Rocher d'Armentier, France.

#mineral #mineralexpert #mineralogy #crystal #silicate

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Large #Monazite crystal from Iveland, Norway.

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert #pegmatite

Columnar aggregate of #Andalusite from pegmatite near Sklené nad Oslavou, Czech Republic.

Size: 8 x 6.5 cm

#MinCup26 #MinCup #pegmatite #mineral #crystal #mineralogy #mineralexpert

Perfect natural #Citrine crystal from Shigar Valley, Gilgit-Baltistan, Pakistan.

This yellow #Quartz variety is very popular, but most of the specimens on the market is heat treated amethyst.

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert

Fresh find of smoky #Quartz in Mt. Blanc Massif, France

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert

Common #Quartz can accommodate other minerals, like #Rutile - resulting in variety called "rutilated quartz".

Here are some examples from Brazil and Austrian Alps:

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert

Red #Cuprite is a minor ore of copper, usually forming as secondary mineral on primary copper ores. Gemmy cuprite crystals are popular among collectors.

Learn more in our comprehensive overview:

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert

mineralexpert.org/article/cupr...

Huge cluster of nice and toxic #Orpiment crystals from China.

#MinCup26 #MinCup #mineral #mineralogy #crystal #mineralexpert #arsenic #sulfide

Big crystal of gemmy red #Sphalerite with #Dolomite from Áliva Mine, Picos de Europa, Spain.

#MinCup26 #MinCup #mineral #crystal #mineralogy #mineralexpert #sulfide