Toyohaite, Franckeite

Specimen ID: F1U-4WA

Mineral(s)
Toyohaite : Ag1+(Fe2+0.5Sn4+1.5)S4
Franckeite : Fe2+(Pb,Sn2+)6Sn4+2Sb2S14
Locality
As recorded:
Oploca Vein System, Pirquitas Ag-Sn Deposit, Rinconada Department, Jujuy Province, Argentina
Mindat locality:
Dimensions
5.1cm x 2.3cm x 1.6cm
Events

Photo added to mindat.org

5.1 x 2.3 x 1.6 cm. Ex. Dr. Werner Paar collection. Toyohaite, a silver iron tin sulfosalt, is very rare species. This specimen features several sub-mm but eye-visible brown crystals clearly contrasted upon the sparkling franckeite matrix. This is the Ag-rich end member of the rhodostannite-toyohaite solid solution series. A very rare mineral originally described from the Toyoha mine in Japan where it occurred in microscopic grains only. For the first time, a new occurrence in Argentina provides eye-visible crystals of this species (to 1 mm), and associated with other rare minerals like pirquitasite, cylindrite and fizelyite-ramdohrite (probably present but not identified as such by analysis). The mineral has a "pseudo-cubic" shape and a color similiar to pyrrhotite.Only very few specimens with crystals were recovered, mostly ending up with the specialist researcher Dr. Werner Paar in Austria for further study; and chances to find additional material are said to be almost none. Crystals from this pocket were micro-probed in his lab, and almost exactly corresponds to the end member composition.
Robert Lavinsky - 14th December 2015

Photo added to mindat.org

5.1 x 2.3 x 1.6 cm. Ex. Dr. Werner Paar collection. Toyohaite, a silver iron tin sulfosalt, is very rare species. This specimen features several sub-mm but eye-visible brown crystals clearly contrasted upon the sparkling franckeite matrix. This is the Ag-rich end member of the rhodostannite-toyohaite solid solution series. A very rare mineral originally described from the Toyoha mine in Japan where it occurred in microscopic grains only. For the first time, a new occurrence in Argentina provides eye-visible crystals of this species (to 1 mm), and associated with other rare minerals like pirquitasite, cylindrite and fizelyite-ramdohrite (probably present but not identified as such by analysis). The mineral has a "pseudo-cubic" shape and a color similiar to pyrrhotite.Only very few specimens with crystals were recovered, mostly ending up with the specialist researcher Dr. Werner Paar in Austria for further study; and chances to find additional material are said to be almost none. Crystals from this pocket were micro-probed in his lab, and almost exactly corresponds to the end member composition.
Robert Lavinsky - 14th December 2015

Photo added to mindat.org

5.1 x 2.3 x 1.6 cm. Ex. Dr. Werner Paar collection. Toyohaite, a silver iron tin sulfosalt, is very rare species. This specimen features several sub-mm but eye-visible brown crystals clearly contrasted upon the sparkling franckeite matrix. This is the Ag-rich end member of the rhodostannite-toyohaite solid solution series. A very rare mineral originally described from the Toyoha mine in Japan where it occurred in microscopic grains only. For the first time, a new occurrence in Argentina provides eye-visible crystals of this species (to 1 mm), and associated with other rare minerals like pirquitasite, cylindrite and fizelyite-ramdohrite (probably present but not identified as such by analysis). The mineral has a "pseudo-cubic" shape and a color similiar to pyrrhotite.Only very few specimens with crystals were recovered, mostly ending up with the specialist researcher Dr. Werner Paar in Austria for further study; and chances to find additional material are said to be almost none. Crystals from this pocket were micro-probed in his lab, and almost exactly corresponds to the end member composition.
Robert Lavinsky - 14th December 2015

Photo added to mindat.org

5.1 x 2.3 x 1.6 cm. Ex. Dr. Werner Paar collection. Toyohaite, a silver iron tin sulfosalt, is very rare species. This specimen features several sub-mm but eye-visible brown crystals clearly contrasted upon the sparkling franckeite matrix. This is the Ag-rich end member of the rhodostannite-toyohaite solid solution series. A very rare mineral originally described from the Toyoha mine in Japan where it occurred in microscopic grains only. For the first time, a new occurrence in Argentina provides eye-visible crystals of this species (to 1 mm), and associated with other rare minerals like pirquitasite, cylindrite and fizelyite-ramdohrite (probably present but not identified as such by analysis). The mineral has a "pseudo-cubic" shape and a color similiar to pyrrhotite.Only very few specimens with crystals were recovered, mostly ending up with the specialist researcher Dr. Werner Paar in Austria for further study; and chances to find additional material are said to be almost none. Crystals from this pocket were micro-probed in his lab, and almost exactly corresponds to the end member composition.
Robert Lavinsky - 14th December 2015

Photo added to mindat.org

5.1 x 2.3 x 1.6 cm. Ex. Dr. Werner Paar collection. Toyohaite, a silver iron tin sulfosalt, is very rare species. This specimen features several sub-mm but eye-visible brown crystals clearly contrasted upon the sparkling franckeite matrix. This is the Ag-rich end member of the rhodostannite-toyohaite solid solution series. A very rare mineral originally described from the Toyoha mine in Japan where it occurred in microscopic grains only. For the first time, a new occurrence in Argentina provides eye-visible crystals of this species (to 1 mm), and associated with other rare minerals like pirquitasite, cylindrite and fizelyite-ramdohrite (probably present but not identified as such by analysis). The mineral has a "pseudo-cubic" shape and a color similiar to pyrrhotite.Only very few specimens with crystals were recovered, mostly ending up with the specialist researcher Dr. Werner Paar in Austria for further study; and chances to find additional material are said to be almost none. Crystals from this pocket were micro-probed in his lab, and almost exactly corresponds to the end member composition.
Robert Lavinsky - 14th December 2015
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