Detailed Description This is a cluster of sharp, lustrous tennantite crystals (up to 2.5 cm on an edge), hosting a few smaller sphalerite crystals (to 0.9 cm). The tennantite crystals on this specimen are robust tetrahedra, with good relief. There is some nice  subtle irridescence on this piece.  In excellent condition, with minor chipping. There […]

Detailed Description This specimen would be called Tennantite, Pyrite, Sphalerite, Quartz but the website doesn’t like such long specimen names. A large, bright, brassy pyrite crystal and sharp, lustrous tennantite crystals host a sprinkling of sphalerite crystals. These are are accompanied by sparkling transparent quartz crystals. Many of the sphalerite crystals are erched along the […]

Detailed Description This is such a great combination piece, with tennantite crystals perched on each other up to the top, and a large bright pyrite crystal. The intergrowth of the tennantite and pyrite is super. The tennantite crystals are very sharp and three-dimensional. In very good condition, with a damaged crystal at the bottom left […]

The well-defined dark grey crystals of tennantite stand out well in contrast to the quartz crystals on this piece. The tennantite crystals measure up to 1.1 cm. In very good condition – the largest crystal has a small nick to the back of a corner (not visible from the display angle) and there are minor […]

Detailed Description This cluster of tennantites features a large nearly-parallel pair of crystals measuring a total of 3.3 cm. These tennantite crystals are very sharp, with clean lines. There are some missing tips (lower on the piece), and the piece demonstrates subtle recrystallization around some surfaces that had been attached to surrounding rock, along with […]

Detailed Description This is a really neat piece. It detached from the surrounding rock during the late stages of formation and has recrystallized on the back and underside, and this explains the specimen’s overall shape and aspect. The display-side tennantites are sharp and brilliantly lustrous. In excellent condition, minor chipping is present and the crystal […]

Detailed Description This is a substantial, robust group of clustered tennantite crystals – it has some heft to it!  Nice intergrowth pattens with a hint of irridesence in places, and a cute quatrz crytstal with rather curious etching patterns on it. In very good condition, some minor chipping is present. Stands perfectly as photographed – […]

Detailed Description This is a great tennantite – it is a piece that detached from the surrounding rock during the late stages of formation and has recrystallized on the back/underside, and this explains the specimen's overall shape and aspect.  The large tennantite crystal faces which are featured across the left and up to the middle […]

Detailed Description This group features large, mirror-bright tennantite crystals, with a few smaller ones perched about. The tennantite crystals exhibit the crystal forms of both the positive tetrahedron and the negative tetrahedron (the latter resulting in the truncations on the crystal tips). In excellent condition, with some chipping, mostly low on the piece, and not […]

Detailed Description This thin plate hosts gorgeous sharp, mirror-bright tennantite crystals. The crystals have beautiful traingular growth patterns and the cornes of the crystals are truncated by the negative tetrathedron form. In excellent condition – very minor chipping, not distracting – this one is very high quality. The back is recrystallized, so this piece detached […]

Detailed Description This is a spectacular cluster of large tennantite crystals with mirror-bright lustre and brilliant sharp triangular crystal growth patterns. These crystals, up to over 4 cm in height, feature positive and negative tetrahedral forms, giving each a truncated shape. In excellent condition, there is an incomplete crystal at the far right and the […]

Detailed Description A sharp, bullet-shaped hexagonal crystal of synchysite. Hollowing/layering at the termination reveals the core. A great synchysite specimen. Browse More Synchysites and other Specimens from this Brazil Update (click here) About these Synchysites These remarkable synchysite crystals are from a recent small pocket at Novo Horizonte. The crystals are particularly interesting on closer […]