Humboldt Co., Nevada, USA

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Adamite : Zn₂(AsO₄)(OH)
	Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA Cuprian adamite associated with duftite. Field of view, 3mm x 3mm. I collected this specimen in 10-06. Brent Thorne Specimen and photograph.
© Brent Thorne 2009	Photo ID: 228087 View Count: 52
Anglesite : PbSO₄
	Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA Anglesite associated with pyrite and sphalerite in quartz. Field of view, 1mm x 1mm. Brent Thorne specimen and photograph.
© Brent Thorne 2009	Photo ID: 227906 View Count: 25
Apatite, Jarosite : KFe³⁺ ₃[(OH)₃\|SO₄]₂
	Golconda Mine, Golconda District, Humboldt Co., Nevada, USA Field of view: 5mm, Photo & Collection: JM.Johannet. Exact locality checked with the collector, Georges Favreau.
© JM. Johannet	Photo ID: 81607 View Count: 235
Apatite-(CaF) (Var: Carbonate-rich Apatite-(CaF)) : Ca₅[(F,O)\|(PO₄,CO₃)₃]
	Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA Hexagonal carbonate fluorapatite crystals with dark green kidwellite. The carbonate fluorapatite crystals have a clea shell with a milky interior. Doug Merson photo and collection.
© DM 06	Photo ID: 64267 View Count: 253
Apatite-(CaF) (Var: Carbonate-rich Apatite-(CaF)) : Ca₅[(F,O)\|(PO₄,CO₃)₃]
	Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA From a micromount specimen with colorful iron oxides showing through clusters of clear Carbonate-fluorapatite crystals. Study material made available at the Northwest Micromineral Study Group during a presentation by Dr. William Wise, 2004. Photomicrograph © Saul Krotki 2006 (.0788.3). Field of view 2.3 mm across.
© Saul Krotki 2006	Photo ID: 72473 View Count: 220
Apatite-(CaF) (Var: Carbonate-rich Apatite-(CaF)) : Ca₅[(F,O)\|(PO₄,CO₃)₃]
	Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA From a thumbnail specimen with colorful iron oxides showing through closely packed clear Carbonate-fluorapatite crystals.Study material made available at the Northwest Micromineral Study Group during a presentation by Dr. William Wise, 2004. Photomicrograph © Saul Krotki 2006 (.0787.2). Field of view 2.0 mm across.
© Saul Krotki 2006	Photo ID: 72471 View Count: 196
Apatite-(CaF) (Var: Carbonate-rich Apatite-(CaF)) : Ca₅[(F,O)\|(PO₄,CO₃)₃]
	Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA From a micromount specimen with colorful iron oxides showing through isolated clear Carbonate-fluorapatite crystals. Study material made available at the Northwest Micromineral Study Group during a presentation by Dr. William Wise, 2004. Photomicrograph © Saul Krotki 2006 (.0788.2). Field of view 1.5 mm across.
© Saul Krotki 2006	Photo ID: 72472 View Count: 182
Arsentsumebite : Pb₂Cu[OH\|SO₄\|AsO₄], Jarosite : KFe³⁺ ₃[(OH)₃\|SO₄]₂
	Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA Yellow-green, blocky crystals of arsentsumebite (checked by X-ray powder diffraction) grew on plates of jarosite. With of image 2 mm. W. Wise specimen and image.
© Wm. Wise (2006)	Photo ID: 50685 View Count: 421
Aurichalcite : (Zn,Cu)₅[(OH)₃\|CO₃]₂
	Silver Coin Mine, Valmy, Iron Point District, Humboldt Co., Nevada, USA Aurichalcite associated with hemimorphite. Field of view, 1mm x 1mm. I collected this specimen in 10-06. Brent Thorne specimen and photograph.
© Brent Thorne	Photo ID: 76201 View Count: 175
Baryte : BaSO₄
	Twin Creeks Mine, Potosi District, Humboldt Co., Nevada, USA Tabular crystals of transparent barite without matrix. The edges where it was not attached to matrix are clean and terminated. Rare barite specimen from this mine known for orpiment and gold. Fluoresces brightly under UV illumination. Overall size of mineral specimen: 4x3x1.5 cm. Size of individual crystals: 1-3 cm.
© 2002 John H. Betts	Photo ID: 4131 View Count: 430