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TZ37AK9: Dioptase
Druze of small rhombohedral Dioptase crystals, transparent and extraordinarily brilliant, on matrix, with small water-clear crystals of Calcite. Dioptase is a rarity in Milpillas. One more surprise from a locality which is accustoming us to surprises.
Milpillas Mine, level 890, Cuitaca, Municipio Santa Cruz, Sonora  Mexico (12/2018)
Specimen size: 3.6 × 3.5 × 1.3 cm = 1.42” × 1.38” × 0.51”
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TRX27AP9: Dioptase
Group of Dioptase crystals on matrix, one of them clearly dominant, with a prismatic habit and the terminations of an acute rhombohedron. Very lustrous, with very deep color.
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Specimen size: 3.3 × 2.5 × 2.1 cm = 1.30” × 0.98” × 0.83”

Main crystal size: 1.5 × 1.2 cm = 0.59” × 0.47”
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TXX47AP9: Dioptase
Group of Dioptase crystals on matrix, with a prismatic habit and the terminations of an acute rhombohedron. Very lustrous, with very deep color.
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Specimen size: 3.4 × 3 × 2.4 cm = 1.34” × 1.18” × 0.94”
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SV2260TPH: Dioptase
Group of profiled Dioptase crystals, with the dominant forms of the short prism and flattened terminal rhombohedron, on matrix, translucent, with good luster and an intense and uniform green color, of considerable dimensions for the species.
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Specimen size: 6.7 × 5.6 × 5.3 cm = 2.64” × 2.20” × 2.09”

Main crystal size: 1.8 × 1.1 cm = 0.71” × 0.43”
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TJB67AP9: Dioptase
Group of Dioptase crystals on matrix, with a prismatic habit and the terminations of an acute rhombohedron. Very lustrous, with very deep color.
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Specimen size: 4.2 × 2.9 × 2.1 cm = 1.65” × 1.14” × 0.83”
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TXX97AP9: Dioptase
Group of Dioptase crystals on matrix, one of them clearly dominant, with a prismatic habit and acute rhombohedral terminations. Very lustrous, with very deep color.
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Specimen size: 6.1 × 4.1 × 2.5 cm = 2.40” × 1.61” × 0.98”

Main crystal size: 2.2 × 1.2 cm = 0.87” × 0.47”
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LR88AK2: Dioptase
Group of very sharp crystals, some of them partially doubly terminated, of good size, brilliant, with very deep color and partially covered by a second generation of small crystals of the same mineral Dioptase. The sample is from the Philippe Morelon collection (No. 805), whose catalogue entry we will send to the buyer.
'Mbumba, Pimbi Hill, Mindouli, Mindouli District, Pool Department  Republic of the Congo (2011)
Specimen size: 4.5 × 3.6 × 2.9 cm = 1.77” × 1.42” × 1.14”
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CP69AH4: Dioptase
Aggregate of prismatic Dioptase crystals with acute rhombohedral terminations. They are translucent, very bright, and have a very deep and uniform color. We’ll send to the buyer the original label and also a copy of the computer card with the full text in the collection catalog.
'Mbumba, Pimbi Hill, Mindouli, Mindouli District, Pool Department  Republic of the Congo
Specimen size: 4.9 × 4.3 × 3.3 cm = 1.93” × 1.69” × 1.30”

Main crystal size: 2.8 × 1.4 cm = 1.10” × 0.55”
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TR89AD1: Dioptase
Aggregate of very elongated crystals that are transparent, very bright and have a very intense color. On matrix, with Calcite. We especially note the locality, very unusual for the species.
Cobrellama deposit, Ica Department  Peru (2004)
Specimen size: 6.7 × 4.8 × 3.1 cm = 2.64” × 1.89” × 1.22”
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TF99AL7: Dioptase
Druse of crystals with rhombohedral habit, staggered edges, translucent and very lustrous. An African classic.
Tantara Mine, Shinkolobwe, Katanga Copper Crescent, Katanga (Shaba)  Democratic Republic of the Congo (Zaire)
Specimen size: 7.3 × 7.2 × 2.7 cm = 2.87” × 2.83” × 1.06”

Main crystal size: 1 × 1 cm = 0.39” × 0.39”
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TT93AL1: Dioptase
A novelty at Tucson 2019. Druze of small elongated Dioptase crystals, with rhombohedral terminations, transparent and with bright luster, on matrix with pale blue shattuckite. Dioptase is a rarity in Milpillas, another surprise like many to which this locality has accustomed us.
The sample has been noted and photographed in the monograph 'The Milpillas Mine' of the ‘Mineralogical Record‘ magazine on page 585 in the volume 52, number 5, September-October 2021 and in the magazine ‘Mineral Up’ on page 42 of the 2020/02 edition.
Milpillas Mine, level 1100, Cuitaca, Municipio Santa Cruz, Sonora  Mexico (2019)
Specimen size: 6.1 × 4.4 × 3.1 cm = 2.40” × 1.73” × 1.22”
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TR93AF6: Dioptase
Druse of rhombohedral crystals with very well defined faces and edges, extraordinarily bright and on matrix.
The sample is from the Vallecillo collection, Madrid.
Renéville, Kindanba District, Pool Department  Republic of the Congo
Specimen size: 7.2 × 5 × 2.5 cm = 2.83” × 1.97” × 0.98”

Main crystal size: 1.6 × 1.4 cm = 0.63” × 0.55”
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MC67I0: Dioptase
Color and luster are magnificent. The group is formed by a lot of crystals with very well defined faces and edges and absolutely free of damage. The specimen, really esthetic, is from a recent find at a classic mine.
Tantara Mine, 20 m.↓, Shinkolobwe, Katanga (Shaba)  Morocco (2006)
Specimen size: 3.8 × 3.1 × 2.2 cm = 1.50” × 1.22” × 0.87”
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MV99H1: Dioptase
The locality is uncommon. The group is consists of a lot of short prismatic crystals which have exceptional color and luster. It’s from a recent find in a forgotten place in which the former pieces hadn’t the same degree of quality.
Tantara Mine, Shinkolobwe, Katanga Copper Crescent, Katanga (Shaba)  Democratic Republic of the Congo (Zaire) (06/2005)
Specimen size: 7.9 × 5.8 × 3.5 cm = 3.11” × 2.28” × 1.38”

Main crystal size: 0.9 × 0.7 cm = 0.35” × 0.28”
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TX16H7: Dioptase
The main crystal, rising on a surface of smaller crystals, can be considered as a giant. Its faces and edges are perfectly defined, bright and partially pseudomorphed by another (undetermined) copper mineral. The matrix is a very rich blue mineral described as Chrysocolla on the label but it must be Plancheite. Please note that although the original labels state that the locality is "near Gouloukoutou River", we have labeled it as Tantara because we believe that this is the right locality.
The sample is with two old labels, of Burminco (George Burnham) and from D.E. Boydston collection.
Tantara Mine, Shinkolobwe, Katanga Copper Crescent, Katanga (Shaba)  Democratic Republic of the Congo (Zaire)
Specimen size: 4.9 × 4 × 3.2 cm = 1.93” × 1.57” × 1.26”
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FH46C0: Dioptase
Attractive color and luster with an excellent disposition contrasting well with its white Calcite matrix.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia
Specimen size: 5.2 × 5 × 4.2 cm = 2.05” × 1.97” × 1.65”
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NE96D3: Dioptase
Top quality specimen. For its perfection, luster, crystal size, transparency, and contrast with its white Calcite matrix this Dioptase is a world class example of this very popular species.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia
Specimen size: 8 × 6 × 2.8 cm = 3.15” × 2.36” × 1.10”
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T49M: Dioptase
A sculptural esthetic and perfectly colored Dioptase on dolomite and calcite. An excellent specimen.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia
Specimen size: 4 × 3 cm = 1.57” × 1.18”
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TM97Q3: Dioptase
Group of crystals of a considerable size for the species. Some of them are doubly terminated and they all have very well defined faces and edges. Color and luster are excellent.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia
Specimen size: 2.2 × 2.6 × 1.6 cm = 0.87” × 1.02” × 0.63”
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MK16R6: Dioptase
Magnificent group, on matrix, of sharp crystals, one of them clearly dominant and very large for the species. The crystals have very uniform and deep color and are very bright.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia
Specimen size: 3.7 × 3.2 × 2.3 cm = 1.46” × 1.26” × 0.91”

Main crystal size: 2 × 2 cm = 0.79” × 0.79”
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TA92AD1: Dioptase on Calcite
Two single and isolated crystals, with a considerable length for the locality, partially doubly terminated, translucent, very bright and implanted on a matrix coated by Calcite.
Kaokoveld Plateau, Kunene Region  Namibia (2011)
Specimen size: 6.7 × 4 × 2.7 cm = 2.64” × 1.57” × 1.06”
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RD92G6: Dioptase on Calcite
Undamaged crystals with a magnificent color and luster and some of them are doubly terminated. Beautifully positioned on a matrix of white Calcite, the piece is ideal for any collection. A great specimen.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (±1973)
Specimen size: 7.7 × 5.2 × 4.8 cm = 3.03” × 2.05” × 1.89”

Main crystal size: 1.2 × 0.7 cm = 0.47” × 0.28”
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BTR94AO6: Dioptase on Dolomite and with Cerussite
Very sharp Dioptase crystals, large for the locality, some of them doubly terminated, translucent, very lustrous and on matrix, with white rhombohedral Dolomite crystals which are also covered by small Dioptase crystals and with a curious Cerussite crystal from which it is difficult to know if it is broken or recrystallized since all of it has a dissolution-like appearance. This specimen is of great quality and comes from an important European collection.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia
Specimen size: 10.5 × 5.2 × 5.7 cm = 4.13” × 2.05” × 2.24”
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MLT47AP3: Dioptase on Plancheite
Group of Dioptase crystals, most of them doubly terminated, more elongated than usual in the species, and extraordinarily lustrous, on matrix, with deep blue Plancheite. The specimen comes from a very little known locality. The Plancheite has been analyzed and we will send a copy of the analysis to the buyer.
Ngouedi mission village, Loutete, Mouyondzi District, Bouenza Department  Republic of the Congo (2022)
Specimen size: 5.8 × 3.2 × 2.4 cm = 2.28” × 1.26” × 0.94”

Main crystal size: 1.8 × 1 cm = 0.71” × 0.39”
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MAL28AP3: Dioptase on Plancheite
Doubly terminated crystal of Dioptase more elongated than usual for the species, translucent and extraordinarily lustrous, on matrix, with deep blue Plancheite. The specimen comes from a little known deposit. The Plancheite has been analyzed and we will send a copy of the analysis to the buyer.
Ngouedi mission village, Loutete, Mouyondzi District, Bouenza Department  Republic of the Congo (2022)
Specimen size: 6 × 3.2 × 2.2 cm = 2.36” × 1.26” × 0.87”

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