Natural History - Calcite and Hematite on Pyrite Crystal Specimen

A cluster of fine, lustrous pyrite crystals form the classic Peruvian locality, crystallising principally as pyritohedrons, with accessory nailhead calcite and a sprinkling of small sphalerites, in ol

. A mixed group comprising: a galena block from Spain; a celestina block from Sicily; a large scalenahedral calcite crystal from Rumania; a block of cubic octahedral pyrite from Peru. 948 grams total,

A large calcite crystal specimen with cortex. 22 kg, 44cm (17 1/4"). From the former stock of Gregory, Bottley & Lloyd (established 1858); recently reviewed by Dr. Ronald Bonewitz.

. Comprising around 80 pyrites or 'fool's gold' crystal specimens. 672 grams total, 15-36 mm (1/2 - 1 3/8 in.). From Peru. From the historic ‘Victorian Museum’ or later collection of Gregory, Bott

Group of five pyrite specimens with well-formed crystals, from Mexico. See Bonewitz, Dr. Ronald Louis, Rocks & Minerals, 2008, p.137. 672 grams, 50 - 80mm (2 - 3 1/2"). Found Mexico; from the historic

A group of pyrite specimens with well-formed crystals ranging in size; some on a matrix. From Peru; from the historic ‘Victorian Museum’ or later collection of Gregory, Bottley & Lloyd (Gregory's)

. A finely crystallised group of pyrite crystals with 'cube modified by octahedron' crystallisation and bright faces, from the old Gregory, Bottley and Lloyd collection from, Huanzala Mine, Ancash Pro

A group of unusually formed, frosted calcite crystals on matrix. From India; From the historic ‘Victorian Museum’ and later collection of Gregory, Bottley & Lloyd (Gregory's); formerly Gregory, Bo

A large sheet of small, acicular calcite crystals on matrix. See Bonewitz, Dr. Ronald Louis, Rocks & Minerals, 2008, p.177. 725 grams, 22cm (8 3/4"). From the historic ‘Victorian Museum’

A very unusual quartz encrustation, originally formed over a group of calcite crystals which were subsequently dissolved away leaving the quartz coating retaining the shapes of the original calcite cr

6 Angel Wing Calcite crystal rocks from Durango Mexico. 6 Natural History Specimens. Largest 8" x 5" x 3.5" From the estate of Frank Hall owner of Dover Scientific and collector of rocks, crystals, mi

Excellent natural specimen

A specimen of vanadinite with calcite, the vanadinite crystals transparent and lustrous, from Mexico, in old white card tray with handwritten label reading: 'Durango, Mexico'. From Durango, Mexico; fr

Missouri Collection: Barite, Chalcopyrite/Dolomite, Galena/Chalcopyrite, Pokrovskite, Calcite, Calcite/Pyrite, Marcasite/Calcite, Galena/Quartz Charlie Hall Collection

A cluster of richly coloured dioptase crystals on a hematite matrix, in white card tray. See Bonewitz, Dr. Ronald Louis, Rocks & Minerals, 2008, p.286. 35 grams, 46mm (1 3/4"). Found Tsumeb, Zaire; fr

New Mexico Collection: Pyrite, Calcite, Mesolite, Brochantite, Hemimorphite, Fluorite Charlie Hall Collection

A group of semi-transparent, blocky, yellow-green apatite encrusting quartz, with accessory calcite and a single prismatic quartz crystal, with handwritten note reading:'APATITE, Panasqueriva', Tipex

Pyrite, Galena, Pink Calcites Sphalerite Specimen Peru 1980's 4oz

A fine specimen of wulfenite consisting a sheet of numerous tabular orange crystals on a matrix of limestone with an underlying sheet of white calcite? From the historic ‘Victorian Museum’ collect

Comprising eleven clusters of pseudo-hexagonal twinned crystals. 313 grams total, 28-54 mm (1 1/8 - 2 1/8 in.). From Brazil.Ex Mineral Imports, London, UK.Gregory, Bottley & Lloyd (Gregory's). [11, No

Comprising lavender-coloured prismatic crystals on a freestanding cut matrix. 283 grams, 72 mm (2 7/8 in.). From a Lincolnshire, UK, collection. Property of a Cambridgeshire, UK, gentleman. [No Reserv

A group of 50 quartz crystal specimens including clear examples with points. 1.67 kg total, 27-87 mm (1 - 3 3/8 in.). Mineral Imports, London, UK.Gregory, Bottley & Lloyd (Gregory's). [50, No Reserve]

117 Grams Very Beautiful Natural Dogtooth Calcite Crystals Specimen From Baluchistan Pakistan size 37mm 65mm 88mm weight 117 Grams Reserve: $20.00 Shipping: Domestic: Flat-rate of $10.00 to anywhere w

96 Gram Beautiful Natural dogtooth Calcite Crystals Specimen From Baluchistan Pakistan size 50mm 30mm 63mm weight 96 Gram Reserve: $20.00 Shipping: Domestic: Flat-rate of $10.00 to anywhere within the