Iowa Co., Wisconsin, USA

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Azurite : Cu₃[OH\|CO₃]₂, Malachite : Cu₂[(OH)₂\|CO₃], Chalcocite : Cu₂S
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA 6.8 x 4.0 x 4.0 cm. An OLD-TIME, CLASSIC and showy combination piece from the site of the first United States lead mining "rush" in the 1820s of royal-blue azurite, malachite, gray chalcocite and bright, brassy chalcopyrite in a box-work matrix of chert. RARE and old material, seldom available. Ex. DuFoe and George Feist Collections.
© Rob Lavinsky	Photo ID: 121113 View Count: 112
Galena : PbS
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA A cluster of three cubic dull lead gray galena crystals, the largest 2.6 cm on edge. The crystals are partly coated an earthy brownish substance. Measures 5.3 x 4.4 x 3.8 cm in size overall and is complete all around. Very clean of damage. Nice old Wisconsin classic. Ex Gene and Sally LaBerge collection.
© Dan & Diana Weinrich	Photo ID: 232102 View Count: 39
Hemimorphite : Zn₄[(OH)₂\|Si₂O₇] · H₂O, Calcite : CaCO₃
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA 8.6 x 6.8 x 4.5 cm. A dog tooth spar, crystal of calcite has been replaced by hemimorphite. Ex. Carnegie Museum and William Jefferis Collection.
© Rob Lavinsky	Photo ID: 184604 View Count: 69
Hemimorphite : Zn₄[(OH)₂\|Si₂O₇] · H₂O, Sphalerite : (Zn,Fe²⁺)S
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA 8.0 x 4.3 x 7.5 cm. An unusual hemisphere of sphalerite has a coating of what seems to be ivory colored hemimorphite. Possibly this is a pseudomorph replacement caught in process. Ex. Carnegie Museum Collection.
© Rob Lavinsky	Photo ID: 184602 View Count: 48
Honessite : Ni₆Fe³⁺₂[(OH)₁₆\|SO₄] · 4H₂O, Calcite : CaCO₃
	West Glanville mine, Linden, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA A piece of the type specimen of honessite (admixed with calcite), obtained in May, 1994 from the discoverer, Allen V. Heyl. His label notes, "Collected on a Sunday in 1946. This is a little bit of the type green honessite material my wife and I collected in 1946. Nearly all was sent to Chalres Milton for identification. In those days the chemistry ...
© Alan Goldstein	Photo ID: 48927 View Count: 254
Smithsonite : ZnCO₃, Calcite : CaCO₃
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA 6.7 x 4.3 x 2.4 cm. This limonite matrix has two crystals, one complete, of smithsonite after calcite. The complete crystal measures 2.25 cm across and it as well as the open hollow crystal are colored yellowish-tan by the cadmium sulfide mineral greenockite. Classic old material hard to obtain today. Ex. Carnegie Museum Collection.
© Rob Lavinsky	Photo ID: 158442 View Count: 83
Smithsonite : ZnCO₃, Calcite : CaCO₃
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA 13.0 x 11.2 x 5.6 cm. This is another old 19th Century mineral specimen from the famous late-1800s Jefferis collection. In this case smithsonite has pseudomorphed calcite crystals which reach 3.75 cm across. In addition, a surface coating of greenockite, cadmium sulfide, has covered the crystals. This is a famous old occurrence and specimens are ...
© Rob Lavinsky	Photo ID: 158404 View Count: 77
Smithsonite : ZnCO₃, Calcite : CaCO₃
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA 12.3 x 6.5 x 5.5 cm. A superb specimen of lustrous well-defined Smithsonite casts after Calcite. The largest of these casts is an amazing 2.4 cm. They are lustrous, numerous, and very well-preserved. Old material, from the early 1900s or late 1800s. Ex. Charlie Key.
© Rob Lavinsky	Photo ID: 180824 View Count: 71
Smithsonite : ZnCO₃, Calcite : CaCO₃
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA 17 x 7 x 7 cm. This is simply one of the finest specimens I have come across from this classic 19th-Century locality. The medium-tan Smithsonite forms spectacular and sharp molds after Calcite, all on a firm Limonite matrix. The largest of the complete casts is a whopping 4 cm across, and the aesthetics of these pseudomorphs is quite good. A rare, ...
© Rob Lavinsky	Photo ID: 167964 View Count: 65
Smithsonite : ZnCO₃, Calcite : CaCO₃
	Mineral Point, Upper Mississippi Valley District, Iowa Co., Wisconsin, USA 6.7 x 4.1 x 2.2 cm. A locality specimen from this classic Wisconsin locality circa mid-1800s , in all likelihood. This is a pseudomorph of Smithsonite, having replaced calcite crystals. Ex. Philadelphia Academy of Sciences Collection.
© Rob Lavinsky	Photo ID: 199688 View Count: 46