Fahlunite from
Timms Hill (Tim's Hill; Iolite Hill), Haddam, Middlesex County, Connecticut, USA
| Locality type: | Hill | |
| Classification | ||
|---|---|---|
| Species: | 'Fahlunite' (not an IMA approved species) | |
| Formula: | (Mg,Fe)Al2Si3O10 · 2H2O | |
| Formation: | Secondary | |
| Comments: | "The pinite [later fahlunite] variety, though generally occurring in indeterminate shaped pieces, yet nevertheless is occasionally seen in forms of the same shape and regularity as the iolite, from which, however, it differs essentially in color and hardness. The peculiar tint affected by the pinite is a pale, bluish, chloride green. Its lustre is pearly, and not particularly shining, except in a few specimens, where the color approaches silver-white. Hardness 2.5. Laminae neither flexible nor elastic. "in rhombic prisms in great abundance at the Iolite locality, and desirable specimens are easily obtainable. Many of these specimens upon being broken show clear blue Iolite in the interior, from which mineral it, is derived as alteration." (Davis, 1901). | |
| Habit: | pseudomorphs after cordierite | |
| Colour: | dull olive green | |
| Quality for species: | Good crystals or rich for species - important (!) | |
| Abundance at site: | Common | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Associated Minerals Based on Photo Data: | ||
| Cordierite | 5 | |
| Quartz | 2 | |
| Chlorophyllite | 1 | |
| Schorl | 1 | |
| Data | ||
| Mineral Data: | Click here to view Fahlunite data | |
| Locality Data: | Click here to view Timms Hill (Tim's Hill; Iolite Hill), Haddam, Middlesex County, Connecticut, USA | |
| Photo Gallery | View Gallery (5 photos) | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 134156 | |
| Long-form Identifier: | 1:3:134156:0 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Fahlunite | ||
| 1.1km (0.7 miles) | ⓘHill above the parsonage (unnamed feldspar quarry), Haddam, Middlesex County, Connecticut, USA | |
| 1.4km (0.9 miles) | ⓘChrysoberyl locality, Haddam, Middlesex County, Connecticut, USA | |
| References | ||
Timms Hill, Haddam, Middlesex County, Connecticut, USA