Stibiconite is an antimony

Antimony

Antimony is a toxic chemical element with the symbol Sb and an atomic number of 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite...

 oxide mineral

Oxide mineral

The oxide mineral class includes those minerals in which the oxide anion is bonded to one or more metal ions. The hydroxide bearing minerals are typically included in the oxide class...

 with formula: Sb₃O₆(OH). Its name originates from Greek "stibi" (antimony) and "konis" (powder), alluding to its composition and habit. It is a member of the pyrochlore

Pyrochlore

Pyrochlore 2Nb2O6 is a solid solution between the niobium end member , and the tantalum end member .-Occurrence:...

 super group.

Discovery and occurrence

It was first described in 1862 for an occurrence in the Brandholz - Goldkronach District, Fichtelgebirge

Fichtelgebirge

The Fichtelgebirge is a mountain range in northeastern Bavaria, Germany. It extends from the valley of the Red Main River to the Czech border, a few foothills spilling over into the Czech Republic. It continues in a northeastern direction as the Ore Mountains, and in a southeastern direction as...

, Franconia

Franconia

Franconia is a region of Germany comprising the northern parts of the modern state of Bavaria, a small part of southern Thuringia, and a region in northeastern Baden-Württemberg called Tauberfranken...

, Bavaria

Bavaria

Bavaria, formally the Free State of Bavaria is a state of Germany, located in the southeast of Germany. With an area of , it is the largest state by area, forming almost 20% of the total land area of Germany...

.

It occurs as a secondary alteration product of other hydrothermal antimony minerals such as stibnite

Stibnite

Stibnite, sometimes called antimonite, is a sulfide mineral with the formula Sb2S3. This soft grey material crystallizes in an orthorhombic space group. It is the most important source for the metalloid antimony...

. It occurs in association with cervantite

Cervantite

Cervantite is an antimony oxide mineral with formula Sb3+Sb5+O4 .It was first described in 1850 for an occurrence in Cervantes, Sierra de Ancares, Lugo, Galicia, Spain, and named for the locality. The mineral was questioned and disapproved, but re-approved and verified in 1962 based on material...

, valentinite

Valentinite

Valentinite is an antimony oxide mineral with formula Sb2O3. Valentinite crystallizes in the orthorhombic system and typically forms as radiating clusters of euhedral crystals or as fibrous masses. It is colorless to white with occasional shades or tints of yellow and red. It has a Mohs hardness of...

, kermesite

Kermesite

Kermesite or antimony oxysulfide is also known as red antimony . The mineral’s color ranges from cherry red to a dark red to a black. Kermesite is the result of partial oxidation between stibnite and other antimony oxides such as valentinite or stibiconite...

, native antimony and stibnite.