Heulandite-Ca and Stilbite-Ca
| ID | 39 | |
|---|---|---|
| Mineral |
Heulandite-Ca
Stilbite-Ca |
|
| Location | Bosa - Sardinia - Italy | |
| Fluorescence | LW-UV: close SW-UV: close |
|
| Mindat.org |
View Heulandite-Ca information at mindat.org View Stilbite-Ca information at mindat.org |
|
Mindat data
| ID | 6988 |
|---|---|
| Long ID | 1:1:6988:1 |
| Formula |
(Ca,Na,K)5(Si27Al9)O72 · 26H2O
|
| IMA Status |
0 1 |
| Other Occurrences | Cavities in basalt and as a devitrification product from volcanic glasses. |
| Diapheny | Transparent |
| Cleavage | Perfect on the {010} |
| Tenacity | brittle |
| Colour | White, colorless, red, yellow, brown, green |
| Hardness (min) | 3.5 |
| Hardness (max) | 4.0 |
| Lustre | Vitreous , Pearly |
| About the name | Named in 1822 by Henry James Brooke in honor of Johann Heinrich "John Henry" Heuland [March 21, 1778 Beyreuth, Germany - November 16, 1856 Hastings, Sussex, England, UK], a mineral collector and mineral dealer living in England and for the suffix indicating dominant Ca. Despite having an international reputation, there are no known images of Henry Heuland. |
| Streak | White |
| Crystal System | Monoclinic |
| Cleavage Type | Perfect |
| Fracture type | Irregular/Uneven,Sub-Conchoidal |
| Morphology | Rhombic prisms, or coffin-shaped tabular crystals, granular, massive. Often in curved aggregates. |
| Twinning | {100} is twin and contact plane. |
| Comment Luster | Pearly on cleavage {010} |
| shortcode_ima | Hul-Ca |
| Group | Heulandite Subgroup |
| ID | 7313 |
|---|---|
| Long ID | 1:1:7313:0 |
| Formula |
NaCa4(Si27Al9)O72 · 28H2O
|
| IMA Status |
0 1 |
| Other Occurrences | A low temperature hydrothermal mineral, in amygdules and cavities in basalt. |
| Diapheny | Transparent,Translucent |
| Cleavage | on {010} |
| Colour | White, colourless, red, light yellow, light to dark brown, cream, orange, pink |
| Hardness (min) | 3.5 |
| Hardness (max) | 4.0 |
| Lustre | Vitreous , Pearly |
| About the name | Named in 1797 by Jean Claude de la Métherie from Greek στιλβη "stilbein", to glitter or shine, or "stilbe", a mirror, alluding to its pearly or vitreous luster. Originally, but inconsistently called zeolite in 1756 by Axel Cronstedt. Named crystalii ad centrum tendentes in 1758 by Cronstedt. In 1772, Johan Gottschalk Wallerius called this mineral zeolite selenitica lamellaris. Also in 1797, de la Métherie called this mineral zeolite nacrée. Werner (1780) called this mineral strehliger zeolith. Rene Just Haüy (1801) used the term stilbite anamorphique for a mineral now recognized as heulandite. Desmine was introduced in 1818 by Johann Friedrich August Breithaupt. Sphaerostilbite was used in 1832 by François Sulpice Beudant. Additional varietal names and synonyms have been proposed: blättricher zeolit, hypostilbite, puflerite, radiated zeolite, and syhedrite. Chemical suffixes were added by the IMA. |
| Streak | White |
| Crystal System | Monoclinic |
| Cleavage Type | Perfect |
| Fracture type | Irregular/Uneven |
| Morphology | Typically thin tabular, sheaflike or globular clusters. |
| Twinning | Ubiquitous on {001}, cruciform and penetration. |
| UV | May fluoresce pale-yellow or blue-white in shortwave UV. |
| Comment Luster | Pearly on cleavage |
| shortcode_ima | Stb-Ca |
| Group | Stilbite Subgroup |
Details
Price: € 10
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| Al | Aluminium | |
| Ca | Calcium | |
| H | Hydrogen | |
| Na | Sodium | |
| O | Oxygen | |
| Si | Silicium |