Same mineral?
Same mineral?
All 7 records concern quartz, SiO₂. A point, a group and a locality name describe different aspects of the material.
Material identity and natural growth origin need evidence beyond a photograph.
Stone Explorer → Clear Quartz comparison tool
Clear quartz, side by side.
Compare 7 natural quartz specimen records, then follow quartz growth in a vein pocket.
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File 07 · 7 natural specimen records
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Each specimen opens its own file.
Evidence
One mineral. 7 records.
Material identity and natural growth origin need evidence beyond a photograph.
What does clarity show?
What does clarity show?
Clarity shows how easily you can see through the observed area. Natural clear quartz can still hold trace elements, fluid pockets and mineral inclusions.
A clear view gives no measurement of chemical purity.
What do the faces show?
What do the faces show?
Prism faces and pointed ends describe the outer growth form. A group places several quartz bodies together.
Face shape alone gives no exact growth time or locality.
Where was it found?
Where was it found?
The image records name Brazil for the group and Middleville, New York, for the Herkimer specimen. The point’s locality is unrecorded.
These localities belong to the pictured specimens. Treatment status requires its own record.
Sources and image credits
Every claim keeps its scope.
Rock crystal names colourless, transparent quartz. Herkimer diamond is a regional quartz name. Natural quartz can have a treatment history; colourlessness alone does not establish an untreated state.
Handbook of Mineralogy: QuartzMaterial reference
Composition, hardness and geological settings. Mineral-level reference; does not identify the pictured specimens.
Open sourceIUCr: Crystal familyMaterial reference
Crystal family and crystal system are different classification levels. Quartz is trigonal within the hexagonal crystal family.
Open sourceStoiber, Tolman and Butler (1945), Geology of Quartz Crystal DepositsMaterial reference
Pages 253–254, 259 and 266–268: documented quartz deposits and weathering. Basis for one vein-pocket pathway; not a history assigned to the photographs.
Open sourceGIA: Unusual Purple Fluid in QuartzMaterial reference
A measured inclusion example. No purple fluid is attributed to these photographs.
Open sourceGIA: Molybdenite Phantoms in QuartzMaterial reference
A documented phantom example. No mineral identity is assigned to internal marks in these photographs.
Open sourceUSGS: Gemstones, QuartzMaterial reference
Historical geological account of Herkimer quartz. A regional name and habit, not another mineral species.
Open sourceQuartz pointCC BY-SA 4.0
W.carter (Ann-Sophie Qvarnström) · Original photograph. CSS display crop only; no recolouring. Locality follows the photo record; no treatment claim.
Open sourceCC BY-SA 4.0Quartz groupCC0 1.0
Parent Géry · Original photograph. CSS display crop only; no recolouring. Locality follows the photo record; no treatment claim.
Open sourceCC0 1.0Herkimer quartzPublic domain, released by copyright holder
Parent Géry · Original photograph. CSS display crop only; no recolouring. Locality follows the photo record; no treatment claim.
Open sourcePublic domain, released by copyright holderFormation diagramsConceptual drawings
One hydrothermal vein-pocket pathway and a conceptual enlarged inclusion detail. No scale, measured micrograph or specimen-specific history.
Growth forms and locality namesMaterial reference
Single points, double terminations, groups, sceptres, Faden and Gwindel describe growth features. Herkimer is a regional name for quartz from the Herkimer area of New York. Double-terminated quartz also occurs elsewhere. In skeletal or window growth, crystal edges develop more strongly than the centres of faces, leaving recessed outlines.
Open sourcePhantoms, fluid and healed cracksMaterial reference
A phantom marks an earlier crystal surface enclosed by later quartz. Fluid inclusions are small cavities containing trapped fluid, sometimes with a gas bubble. Trails of inclusions can follow healed fractures. These structures record different growth and fracture events; their shapes alone give neither a mineral identification nor an elapsed time.
Open sourceClear quartz and included quartzMaterial reference
Clear quartz names the colourless quartz host. Faden and phantom features can occur within it. Strongly coloured mineral inclusions may justify a more specific included-quartz name. Quartz with golden rutile or a green chlorite phantom provides a related inclusion comparison. Both have a quartz host.
Open source
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