Rocks, Minerals, Collectibles, Geology
I picked up a small lot of these specimens that are primarily quartz with a sprinkling of tennantite (As-rich tetrahedrite) and siderite. These are great combo pieces. The pieces are fairly large, ranging from small cabinet to cabinet sized. The quartz clusters that the other minerals were deposited on give a nice 3D aspect to the pieces and most sit nicely for display. The quartz has a very interesting habit with a tapering cone shape. You don't see the typical prismatic faces.
Page 14, Quartz with Tennantite and Siderite, Julcani Mine, Angaraes Province, Huancavelica Department, Peru
CR 1441: Quartz with tennantite, 5.5 cm x 5.5 cm x 3.0 cm, 70 grams. $25. This piece has very little siderite, only a few indistinct grains. It sits nicely for display, excellent condition.
CR 1442: Quartz with tennantite and siderite, 6 cm x 5 cm x 5.0 cm, 119 grams. $45. This piece sits nicely and displays well from both sides though the back has very little siderite/tennantite and highlights the quartz. This piece is an excellent example of the interesting quartz habit these pieces exhibit.
CR 1443: Quartz with tennantite and siderite, 6 cm x 5 cm x 5.0 cm, 161 grams. $65. This piece sits nicely and displays well in two orientations. A small portion of the quartz matrix is visible (upper right in the left picture, lower left on the right picture). A nice heavy coating of sulfide but not completely covering the quartz.
CR 1444: Quartz with tennantite and siderite, 9 cm x 8 cm x 4.5 cm, 206 grams. $65. This piece lays flat and would need a stand to be erect. The heavy siderite coating hides the quartz in the view on the left. There are nice sharp tennantite crystals up to about 5 mm, mostly visible in the photo on the right which also give a better view of the underlying quartz crystals.
CR 1445: Quartz with tennantite and siderite, 9 cm x 6 cm x 6 cm, 322 grams. $85. As shown, this piece is propped up. A good coating of tennantite and siderite, but not too much to obscure the interesting quartz habit.
CR 1447: Quartz with tennantite and siderite, 12 cm x 11 cm x 5 cm, 393 grams. $180. An excellent piece. As you can see on the back, the secondary minerals cover the surface. Although you cannot tell by the photo, the quartz on the back is in excellent condition except for one small point, less than a centimeter square, that may have been the attachment point. Very interesting quartz. A great combo piece and a nice addition for anyone who collects mineral "flowers".