15 Piece Crystal & Aggregate Collection

Contains 15 specimens, approximately 1 1/2" x 1 1/2" showing different crystal habits and aggregation of minerals such as dendritic, fibrous, micaceous, banding, and radiated.

Many minerals form distinct crystal patterns as the crystals grow. Minerals may form isolated or distinct crystals, in radiating or parallel groups, or in a collection of crystals call aggregates.

 15 Piece Crystal & Aggregate Collection

Crystal Habits & Aggregates Collection

Aggregates of minerals sometimes are composed of scales or lamellae or of grains. Below is a list of terms geologists use to describe these crystal habits:

ACICULAR slender, needle like crystals
BANDED narrow bands of differing colors
BOTRYOIDAL globular forms like a bunch of grapes
COLLOFORM spherical forms of radiating crystals
CONCENTRIC spherical layers around a common center
DENDRITIC slender divergent branches
FIBROUS slender fiber aggregate of crystals
FOLIATED easily separated into plates
GLOBULAR radiating crystals forming small spheres
LAMELLAR plate like crystals forming layers
MASSIVE a mineral without distinguishing features or form
OOLITIC aggregate of small spheres resembling fish eggs
RADIATED radiating crystal groups
RETICULATED lattice like groups of crystals
STALACTITIC conical/cylindrical deposits of minerals
AMYGDALOIDAL a rock with mineral filled cavities
BLADED elongated, flattened crystals
CAPILLARY hair like crystals
COLUMNAR column like crystal
CONCRETION minerals formed around a nucleus
DRUSY a layer of small crystals on a surface
FILIFORM embedded threadlike crystals
GEODE a spherical hollow cavity lined by a mineral(s)
GRANULAR composed of grain like crystals
MAMMILLARY large round masses resembling mammae
MICACEOUS easily separated into thin sheets
PISOLITIC aggregate of spheres the size of peas
RENIFORM radiating crystals forming kidney shapes
ROSETTE a flowerlike crystal growth of minerals
STELLATED radiating crystals forming circular groups
 
MINERAL
1. Actinolite
2. Rutile in Quartz
3. Wavellite
4. Barite
5. Vanadinite
6. Spodumene
7. Gypsum var. Satin Spar
8. Biotite
9. Barite
10. Olivine
11. Hematite
12. Bauxite
13. Onyx
14. Chalcedony
15. Gypsum var. Alabaster  
  		 
STATE OF AGGREGATION
Acicular
Filiform
Radiated/Stellated
Rosette
Drusy
Columnar
Fibrous
Micaceous
Lamellar/Tabular
Granular
Oolitic
Pisolitic
Banded
Massive
Massive
 
 
Item Description

Price

Qty
35045
15 Piece Crystal & Aggregate Collection
 $24.25