Selection philosophy
Selected specimen by specimen.
Selection is a considered human judgement based on the individual specimen. Matrix does not present an artificial numerical grade or imply standardized laboratory grading.
How we select
Careful judgement, not artificial grades.
The selection system keeps attention on what can be observed, documented and understood about each specimen.
Mineral identity
What the specimen contains, using the most accurate verified identification available.
Morphology
Crystal form, habit and the way the mineral has developed.
Association
How primary and associated minerals occur together.
Aesthetic balance
Composition, display orientation, contrast and visual character.
Condition
Visible condition and disclosed repair or treatment information when supplied.
Locality
The usefulness and confidence of the specimen’s recorded origin.
Collector interest
Scientific, locality, morphological or aesthetic reasons a specimen may merit attention.