Search Archived Mineral Specimens
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia
- Formula
- Y4Cu(CO3)4Cl(OH)5·2H2O
- Size
- Miniature 3.5x1.5x0.6cm
- Tagged
- carbonate , copper , REE mineral
- Special Info
- Type Locality
Superb, rich specimen of Decrespignyite-(Y) with bright royal blue layers.
- Availability
- Sold
- Locality
- Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia
- Formula
- Y4Cu(CO3)4Cl(OH)5·2H2O
- Size
- Miniature 4.5x4x1.3cm
- Tagged
- carbonate , REE mineral
- Special Info
- Type & Only Locality
Superb specimen of rich pastel blue, spherulitic crystals of extremely rare Decrespignyite. This is the type and only locality for this mineral rich in rare earth elements. Good coverage on both sides.
- Availability
- Sold
- Locality
- Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia
- Formula
- Y4Cu(CO3)4Cl(OH)5·2H2O
- Size
- SmCabinet 6x5x1.5cm
- Tagged
- carbonate , copper , REE mineral
Bright sky blue globular crystal aggregtes to 0.75mm and as large patches or crusts 3 x4mm in area. Decrespignyite-(Y) is a yttrium - copper bearing REM and a carbonate. It is according to Mindat composed of individual tiny pseudohexagonal, often curved platelets. It is found at only one locality worldwide.
As noted by the mineral name, Decrespignyite-(Y), contains the rare-earth element yttrium. Major applications of yttrium are extensive and include fluorescent lamps, phosphor compounds in computer monitirs, lasers, lighting applications, abrasives, bearings, and high-temperature alloys amongst others. Recent cost for yttrium oxide in 2019 was $14/lb down from $65/1b in 2011. The main source for yttrium is China, but worldwide reserves are found in Australia, Brazil, and India.
- Availability
- Sold
- Locality
- Paratoo Cu mine, Mt Lofty Ranges, South Australia, Australia
- Formula
- Y4Cu(CO3)4Cl(OH)5·2H2O
- Size
- Miniature 4.5x4x1.5cm
- Tagged
- carbonate , REE mineral
- Special Info
- Type & Only Locality
Bright sky blue globular to spheroidal crytstal groups. Excellent coverage.
- Availability
- Sold
- Locality
- Campbell Shaft, Cochise Co., Arizona, United States
- Formula
- CuFeO2
- Size
- Miniature 4x5x3cm
- Tagged
- copper
Black botryoidal Delafossite with tiny, less than 1mm octahedral Cuprite crystals scattered amongst with the backside covered by deep blue Azurite crystals (backside not pictured, but rich!).
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Khibiny Massif, Kola Peninsula, Russia
- Formula
- K7Na3Ca5Al2Si14O38F4Cl2
- Size
- SmCabinet 6x4x3cm
Light tan to white-gray plats to over 1cm in matrix with Eudialyte.
