“2.7 x 2.2 x 1.3 cm. A very rarely seen specimen of yellow hydrotungstite from the type locality at the San Antonio de Calacalani Mine, Bolivia. The piece comes to us from the collection of Paolo Matioli, and is associated with tungstite on a well-crystallized ferberite matrix. ”

“2.7 x 2.2 x 1.3 cm. A very rarely seen specimen of yellow hydrotungstite from the type locality at the San Antonio de Calacalani Mine, Bolivia. The piece comes to us from the collection of Paolo Matioli, and is associated with tungstite on a well-crystallized ferberite matrix. ”

“2.7 x 2.2 x 1.3 cm. A very rarely seen specimen of yellow hydrotungstite from the type locality at the San Antonio de Calacalani Mine, Bolivia. The piece comes to us from the collection of Paolo Matioli, and is associated with tungstite on a well-crystallized ferberite matrix. ”

“2.7 x 2.2 x 1.3 cm. A very rarely seen specimen of yellow hydrotungstite from the type locality at the San Antonio de Calacalani Mine, Bolivia. The piece comes to us from the collection of Paolo Matioli, and is associated with tungstite on a well-crystallized ferberite matrix. ”

“2.7 x 2.2 x 1.3 cm. A very rarely seen specimen of yellow hydrotungstite from the type locality at the San Antonio de Calacalani Mine, Bolivia. The piece comes to us from the collection of Paolo Matioli, and is associated with tungstite on a well-crystallized ferberite matrix. ”