This gorgeous mineral is found only in the rocks of Castleton, Derbyshire. Blue John is a colour banded form of fluorspar, and has been mined since the mid-1700s. By the late 1700s, it was a popular choice for columns and vases in fine houses across the country! #MineralMonday

#mineralmonday
CALCITE
and its classical (deformation?) twinning.
#science #geology #mineralogy #minerals #rocks #marble #photography #microscopy

Chalcopyrite is probably the most important and major source of copper, and the most abundant copper ore. This on is beautiful with brassy chalcopyrite crystals and fluorite cubes that look almost regal. It is likely to be from the Carn Brea area. #MineralMonday

415 million years ago, this jasper cobble & masses of other debris got transported by a flash flood, eventually forming the conglomerates in Auchmithie. Therefore, this cobble has been around for significantly longer & is quite probably > 1 billion years old. Wild! #MineralMonday

Stalactites of limonite, an iron ore mineraloid that is a mixture of minerals, from Tuscaloosa, Alabama. This one probably has a lot of goethite in it. #MineralMonday #GeoscienceTwitter

Siderite from Carreg Fawr, Wales. Collected in 1913, which isn’t even that old for the Hunterian’s collection. #MineralMonday #GeoscienceTwitter

Wore an old jacket today and found this wee Fife agate in the pocket 🖤 #MineralMonday

Tourmaline from Brazil, wild growth #mineralmonday

Everything's blue in this world.. #MineralMonday

Boleite from Mexico. KPb₂₆Ag₉Cu₂₄(OH)₄₈Cl₆₂ #mineralmonday

Literally me at work 😭 #MineralMonday

What do Steven Universe, Dungeons and Dragons, and January's birthstone all have in common...?

Joi is back in the Cullen Hall of Gems and Minerals with some fun facts about garnet. Check it out!
#Gemstones #Birthstone #Garnet
#January #Museum #MineralMonday

mineralmonday
Garnet, Biotite and a nice crenulation in this 1,7 Ga-old schist from the Picuris mountains, New Mexico.

This frosty #MineralMonday learn from mineralogist Mike Wise about how and why ice is considered a mineral. 🧊

#mineralmonday A memorable afternoon on 20 Oct when I attended a ceremony at Worcester Guildhall to collect my British Empire Medal, awarded for 'services to mineralogy' in the King's Birthday Honours List. Thank you to everyone who helped make this happen. #minerals #geology

Current pocket rock with goth aesthetic - wee slice of calcite and anthracite from East Fife 🖤 #MineralMonday

Here’s some beautiful pink and white calcite slickenfibres on faulted carboniferous limestone for #MineralMonday 🖤

#mineralmonday M&M10 - Registration is now open for Mineralogy and Museums conference number 10. Amgueddfa Cymru – Museum Wales, Cardiff, Wales, 12-13 Aug 2024 events.minersoc.org/Event-Registra… more details here mm-10.org See you in Wales! #minerals #museums #mining #geology

#mineralmonday 60th Anniversary of the death of the legendary British mineralogist and collector Sir Arthur Russell - Free talk and workshop on Saturday 24 Feb See mindat.org/mesg-646926.ht… #minerals #mining #geology #berkshire #crystals #mineralogy

Books of thin muscovite crystals on albite crystals. Mica is sometimes touted as an eco friendly alternative for plastic glitter, but is sometimes still covered in plastic, and child labour can be an issue in its mining. #MineralMonday #GeoscienceTwitter