Lmst

A new one for me - specular hematite (aka specularite), bright silver hexagonal plates and metallic masses in a dark matrix. It got an ultrasonic clean, but otherwise as found, near to one of the concrete ore washing buddles at Bassett and Grylls mine, Wendron, Cornwall.

There is a lot of really shiny mica and coal dust on this site, but even with a crust of clay over most of it, it it was obvious that this was much brighter, sparkly mineral when I picked it up.

According to "The geology of Poldark Mine and it's surrounding area" by N. G. LeBoutillier, this mineral is a high temperature one that occurs in the "roots of the lode", indicating that there is not much tin left below - most of it has eroded away from kilometres of rock above the current surface level a long time ago. This is the reason so much of it was present in the soil and stream sediment in the area.

mindat.org minID: V04-YHW
Field of View: 2.5 - 10mm

#Cornwall #MicroMinerals #Fossicking #CornishMinerals #MineralSpecimens #Crystals #FossickingCornwall #Mineralogy #MineralCollecting #GeologyRocks

Overall view of shiny metallic masses, with plate like crystals in areas. Dark rock surrounds them.

Close up view on some of the plate like silver crystals, showing faces on the edges.

Close up view of hexagonal silver crystals surrounded by dark matrix rock and pink clay and oxides.

This one's for those within about an hour's drive of Danbury CT USA: come to our little (16 vendor) #gemandmineralshow #mineralshow this weekend at New Milford High School in #NewMilfordCT #LitchfieldCountyCT #Connecticut #WesternConnecticut
#DanburyMineralogicalSociety
https://danburymineralogicalsociety.weebly.com/ #rockcollecting #mineralcollecting #crystals #lapidary #hobbies

Flyer in vertical rectangle format composed of 6 color block areas. Top title block has "2023 GEM, JEWELRY, MINERAL & FOSSIL SHOW" in white on a background of polished pebbles. Below that it splits into two columns. On the left are three images stacked on top of each other, top to bottom: side view of amethyst crystals, some purplish round gem bead bracelets on a pale skinned wrist with more beads in the background, then an assortment of various colored polished and rough specimens. On the right text reads: "sponsored by THE DANBURY MINERALOGICAL SOCIETY; Saturday, September 9, 10-5 pm. Sunday, September 10, 10-4 pm. NEW MILFORD HIGH SCHOOL, 388 DANBURY RD (ROUTE 7), NEW MILFORD, CT 06776.
HOURLY DOOR PRIZES, GRAND PRIZE, GRAB BAGS, CLUB INFORMATION, SPECIMEN IDENTIFICATION, DISPLAYS.
PLENTY OF FREE PARKING. HANDICAPPED ACCESSIBLE. Admission: $5 Adults, $4 seniors & full-time students w/ID. FREE admission for kids 11 & under & Scouts in uniform.
The bottom segment is blue with white text and blue and white icons for phone: (845) 319-6089, web https://danburymineralogicalsociety.weebly.com/ , and Facebook: Danbury Mineralogical Society PAGE

Datolite, CaB(SiO4)(OH) - white crystals
Fluorite, CaF2 - blue crystal
UK39, a member of the hellandite group - the spray of cystals on corner of fluorite

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Cordylite-(Ce), (Na,Ca, )BaCe2(CO3)4(F,O)

Yellow crystal associated with quartz.

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Chabazite-Na, (Na3K)[Al4Si8O24]·11H2O

Mass of thin plates of chabazite.

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.5 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Celestine, Sr(SO4)

Mass of tiny white celestine crystals at center.

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.2 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Catapleiite, Na2Zr(Si3O9)·2H2O

Colorless catapleiite with dark green aegirine.

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.6 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Carletonite, KNa4Ca4Si8O18(CO3)4(F,OH)·H2O
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.7 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

•Cancrisilite, Na7(Si7Al5)O24(CO3)·3H2O
Was cancrinite until cancrisilite was described.
Per communication from László Horvath on 6 June 2007, the only cancrinite at MSH is the yellow. The colorless and pale mauve have been shown to be cancrisilite. Analysis by XRD, EMPA, and IR.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.9 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Burbankite, (Na,Ca)3(Sr,Ba,Ce)3(CO3)5
Yellowish hexagonal prisn of burbankite. The acicular crystals at upper left are aegirine.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.0 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Brookite, TiO2
Cluster of several black brookite crystals.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.1 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Birnessite, (Na,Ca,K)0.6(Mn4+,Mn3+)2O4·1.5H2O
Ranciéite, (Ca,Mn2+)0.2(Mn4+,Mn3+)O2·0.6H2O
Originally described as birnessite, new research showed to be a mixture with ranciéite.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Annite, KFe2+3(AlSi3O10)(OH)2
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.6 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Berthierine, (Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Ancylite-(Ce), CeSr(CO3)2(OH)·H2O
Two hexagonal pale green berthierine crystals plus 2 cololess ancylite-*Ce)_ crystals.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.6 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology #earthsciences #mineral collecting

Bavenite, Ca4Be2+xAl2-xSi9O26-x(OH)2+x (x = 0 to 1)
Pale yellow to white bavenite plates.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology

Barylite, BaBe2Si2O7
Two barylite crystals
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 1.0 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology

Baryte, Ba(SO4)
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 0.8 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology

Astrophyllite, K2NaFe2+7Ti2(Si4O12)2O2(OH)4F - the dark to light brown crustals.
Sphalerite, ZnS - the pale pink crystal just above center.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 4.0 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology

Astrophyllite, K2NaFe2+7Ti2(Si4O12)2O2(OH)4F

spray of thin light brown crystals.
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 2.0 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology

Ashcroftine-(Y), K5Na5Y12Si28O70(OH)2(CO3)8·8H2O as fine fibers.
Aegirine, NaFe3+Si2O6 - the dark green crystals
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
FOV = 3.2 mm
#minerals #mineralogy #mineralcollecting #crystals #Geology

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