POŠEPNÝITE Mineral Details

Complete mineralogical data for POŠEPNÝITE. Chemical Formula: (Cu+3+x□3-x)(Hg2+4-xCu+2+x)Sb4(Se12.5□0.5) (0<x <<2). Crystal System: Isometric. Learn about its geologic occurrence, habit, and identification.

POŠEPNÝITE

(Cu+3+x□3-x)(Hg2+4-xCu+2+x)Sb4(Se12.5□0.5) (0<x <<2)

Crystal System

Isometric

Crystal Class

Cubic hextetrahedral

Space Group

I43m

Point Group

4 3 m

Structure & Data

Crystal Structure

Typified by presence of trig ∆ of As, Sb, Bi that represent FBB in structure with 3 S atoms forming base of ∆ & metalloids As, Sb, Bi at apex; this can be attributed to lone-electron-pair effect of metalloid ions; XS3 ∆, neso-sulfarsenites, etc. with add’l S; tetrahedral framework (like sphalerite), 2 add’l S[6] in elementary cell; S octahedrally coordinated by 6 Cu[3] atoms & tetrahedrally by Cu3Sb; As linked to S atoms as trig ∆; metal atoms have tetrahedral & triangular coordinations.2 Framework type with CuIS4 tetrahedra; there are large holes of truncated tetrahedron shape, which contain 4 As(Sb) with [3]-∆ coordination, 4 CuI, & 2 CuII, both of latter with [3] planar coordination, as well as SII in center of hole.3 Contains 2 sorts of Cu atoms; 1st type is coordinaed by 4 S atoms at 2.342 Å which form nearly regular tetrahedron; 2nd type of Cu atom is in unusual triangular coordination, being bonded only to 1 S atom at 2.234 Å & 2 at 2.272 Å; this grp is planar, & Cu atom has highly anisotropic terminal motion; Sb atom is bonded to 3 S atoms at 2.446 Å, which form bond angles of 95o8′, but has 6 add’l S neighbors at van der Waals distance of 4.033 Å; polyhedra are linked in complex manner.4 See “Additional Structures” tab for entry(s).5 Cubic structure is tetrahedral framework with cavities & part of tetrahedra repl by SbSe3 coordination ∆’s; it has 1 type of ∆ Sb position, 1 type of tetrahedrally coordinated cation position M1 occupied by (Hg, Cu), & 1 type of partly vacant cation site M2 with triangular coordination; main anion site Se1 participates in all of these cation coordination polyhedra; minority anion ‘Se2’ ties 6 coordination triangles of Cu2 in cavity of tetrahedral framework into 1 cluster.6

Cell Data

a=10.964Å, Z=2

Geology & Identification

Geologic Occurrence

Base metal districtPOŠEPNÝITEPOŠEPNÝITE

Habit

Hypidiomorphic submicro grains

Twinning

Relationships

RELATIONSHIP TO OTHER MINERALS

Tetrahedrite group

If you are fascinated by the hidden structures of our planet, you have likely come across POŠEPNÝITE. This mineral is a compelling subject for study, offering a unique glimpse into the complex chemistry that shapes the Earth’s crust.Whether you are a student identifying a hand sample, a researcher looking for crystallographic data, or a collector curious about a new find, this guide breaks down everything you need to know about POŠEPNÝITE. From its precise chemical formula to the geological environments where it thrives, let’s explore what makes this mineral distinct.

The Chemistry Behind the Crystal

Every mineral tells a story through its chemistry. At its core, POŠEPNÝITE is defined by the chemical formula (Cu+3+x□3-x)(Hg2+4-xCu+2+x)Sb4(Se12.5□0.5) (0.This isn’t just a string of letters and numbers; it represents the precise recipe of elements that nature used to build this specimen. This specific chemical composition is what gives the mineral its stability and dictates how it reacts with acids, heat, or other minerals. It is the fundamental “DNA” that geologists use to classify it within the larger mineral kingdom.
Crystallography: Geometry in Nature
One of the most beautiful aspects of mineralogy is the hidden geometry within every stone. POŠEPNÝITE crystallizes in the Isometric system.Think of this as the mineral’s architectural blueprint. It dictates the symmetry and the angles at which the crystal faces grow. Digging deeper into its symmetry, it falls under the Cubic hextetrahedral.
Point Group: 4 3 m
Space Group: I43m
Why does this matter? These crystallographic details are like a fingerprint. They influence optical properties—how light travels through the crystal—and physical traits like how it breaks or cleaves when struck.
Internal Structure and Unit Cell
If we could zoom in to the atomic level, we would see the “Unit Cell”—the smallest repeating box of atoms that builds up the entire crystal. For POŠEPNÝITE, the dimensions of this microscopic building block are:
a=10.964Å, Z=2
The internal arrangement of these atoms is described as:
READ ALSO ZENZÉNITE Mineral Details
Typified by presence of trig ∆ of As, Sb, Bi that represent FBB in structure with 3 S atoms forming base of ∆ & metalloids As, Sb, Bi at apex; this can be attributed to lone-electron-pair effect of metalloid ions; XS3 ∆, neso-sulfarsenites, etc. with add’l S; tetrahedral framework (like sphalerite), 2 add’l S[6] in elementary cell; S octahedrally coordinated by 6 Cu[3] atoms & tetrahedrally by Cu3Sb; As linked to S atoms as trig ∆; metal atoms have tetrahedral & triangular coordinations.2 Framework type with CuIS4 tetrahedra; there are large holes of truncated tetrahedron shape, which contain 4 As(Sb) with [3]-∆ coordination, 4 CuI, & 2 CuII, both of latter with [3] planar coordination, as well as SII in center of hole.3 Contains 2 sorts of Cu atoms; 1st type is coordinaed by 4 S atoms at 2.342 Å which form nearly regular tetrahedron; 2nd type of Cu atom is in unusual triangular coordination, being bonded only to 1 S atom at 2.234 Å & 2 at 2.272 Å; this grp is planar, & Cu atom has highly anisotropic terminal motion; Sb atom is bonded to 3 S atoms at 2.446 Å, which form bond angles of 95o8′, but has 6 add’l S neighbors at van der Waals distance of 4.033 Å; polyhedra are linked in complex manner.4 See “Additional Structures” tab for entry(s).5 Cubic structure is tetrahedral framework with cavities & part of tetrahedra repl by SbSe3 coordination ∆’s; it has 1 type of ∆ Sb position, 1 type of tetrahedrally coordinated cation position M1 occupied by (Hg, Cu), & 1 type of partly vacant cation site M2 with triangular coordination; main anion site Se1 participates in all of these cation coordination polyhedra; minority anion ‘Se2’ ties 6 coordination triangles of Cu2 in cavity of tetrahedral framework into 1 cluster.6This internal structure is the invisible framework that supports everything we see on the outside, from the mineral’s density to its hardness.
READ ALSO SCHLEGELITE Mineral Details
Physical Appearance (Habit)
When you find POŠEPNÝITE in the field, what does it actually look like? A mineral’s “habit” describes its typical shape and growth pattern.
Common Habit: Hypidiomorphic submicro grains
Twinning:
Twinning is a fascinating phenomenon where two or more crystals grow interlocked in a specific symmetrical pattern. If POŠEPNÝITE exhibits twinning, it can be a dead giveaway for identification, distinguishing it from look-alike minerals.
Where is it Found? (Geologic Occurrence)
Minerals are the products of their environment. They don’t just appear anywhere; they need specific conditions—pressure, temperature, and chemical ingredients—to form.Geologic Occurrence: Base metal districtKnowing this context helps geologists reconstruct the history of a rock formation. It tells us whether the rock was born from cooling magma, settled in an ancient ocean, or was transformed by the intense heat and pressure of metamorphism. For more broad geological context, resources like the U.S. Geological Survey (USGS) provide excellent maps and data.
Related Minerals
No mineral exists in a vacuum. POŠEPNÝITE is often related to other species, either through similar chemistry or structure.Relationship Data: Tetrahedrite groupUnderstanding these relationships is key. It helps us see the “family tree” of the mineral world, showing how different elements can substitute for one another to create an entirely new species with similar properties.
READ ALSO MAGNESIONIGERITE-2N1S Mineral Details
Frequently Asked Questions (FAQs)
1. What is the chemical formula of POŠEPNÝITE?The standard chemical formula for POŠEPNÝITE is (Cu+3+x□3-x)(Hg2+4-xCu+2+x)Sb4(Se12.5□0.5) (0. This defines its elemental composition.2. Which crystal system does POŠEPNÝITE belong to?POŠEPNÝITE crystallizes in the Isometric system. Its internal symmetry is further classified under the Cubic hextetrahedral class.3. How is POŠEPNÝITE typically found in nature?The “habit” or typical appearance of POŠEPNÝITE is described as Hypidiomorphic submicro grains. This refers to the shape the crystals take when they grow without obstruction.4. In what geological environments does POŠEPNÝITE form?POŠEPNÝITE is typically found in environments described as: Base metal district. This gives clues to the geological history of the area where it is discovered.5. Are there other minerals related to POŠEPNÝITE?Yes, it is often associated with or related to other minerals such as: Tetrahedrite group.
External Resources for Further Study
For those looking to dive deeper into the specific mineralogical data of POŠEPNÝITE, we recommend checking high-authority databases:
Mindat.org – The world’s largest open database of minerals.
Webmineral.com – Detailed crystallography and mineral properties.
International Mineralogical Association (IMA) – The official list of approved mineral names.
Final Thoughts
POŠEPNÝITE is more than just a name on a list; it is a testament to the orderly and beautiful laws of nature. With a chemical backbone of (Cu+3+x□3-x)(Hg2+4-xCu+2+x)Sb4(Se12.5□0.5) (0 and a structure defined by the Isometric system, it holds a specific and important place in the study of mineralogy.We hope this overview has helped clarify the essential data points for this specimen. Whether for academic study or personal interest, understanding these properties brings us one step closer to understanding the Earth itself.