Aragonite
| ID | 618 | |
|---|---|---|
| Mineral | Aragonite | |
| Location | Unknown - Unknown - Unknown - Unknown | |
| Fluorescence | LW-UV: check SW-UV: check |
|
| Mindat.org |
View Aragonite information at mindat.org |
|
Mindat data
| ID | 307 |
|---|---|
| Long ID | 1:1:307:6 |
| Formula |
Ca(CO3)
|
| IMA Status |
0 1 |
| Description | Aragonite Group. The Ca analogue of strontianite. The principal member of the Aragonite Group, aragonite is the second most common polymorph of natural calcium carbonate (the most common is calcite). It is significantly less widespread and abundant... |
| Other Occurrences | As speleothems in limestone caves; as pisolites, sinters and massive lamellar deposits at geysers and hot springs; as seafloor oolites; with siderite in iron deposits; with calcite and dolomite and other magnesium minerals in altered serpentinites, dunites and peridotites; and as a replacement mineral in various rock types and ore deposits, formed from low-temperature and pressure aqueous solutions. |
| Discovery Year | 1797 |
| Diapheny | Transparent,Translucent |
| Cleavage | On {010} distinct; On {110} and {011} very indistinct. |
| Tenacity | brittle |
| Colour | Colorless to white or grey, often stained various hues by impurities, such as blue, green, red or violet; colourless in transmitted light. |
| Hardness (min) | 3.5 |
| Hardness (max) | 4.0 |
| Luminescence | Fluoresces pale rose, yellow, bluish, often with greenish phosphorescence, under LW, yellowish in SW. |
| Lustre | Vitreous to resinous. |
| About the name | Named in 1797 by Abrahan Gottlob Werner for the type locality, the village of Molina de Aragón, Spain, and not the province of Aragón, a mistake made by several later writers. |
| Streak | Uncolored/white. |
| Crystal System | Orthorhombic |
| Cleavage Type | Distinct/Good |
| Fracture type | Sub-Conchoidal |
| Morphology | Short to long prismatic [100], sometimes flattened {010}; acicular, often with steep pyramidal or domed terminations; or tabular {001}; also stalactic, columnar, in stellate or radiating aggregates, and fibrous crusts of tiny acicular crystals. |
| Twinning | Single crystals are typically twinned cyclically on {110} producing pseudo-hexagonal aggregates of contact and penetration twins. Polysynthetic twinning produces lamellae or fine striations parallel to [100]. |
| UV | Pale rose, yellow, white or bluish, with greenish or white phosphorescence (LW UV); yellowish (SW UV). |
| Thermal Behaviour | Begins to convert to calcite at about 400°C when heated in dry air. Thermoluminescent. |
| shortcode_ima | Arg |
| Group | Aragonite Group |
Details
Price: € 2
Dimensions: Not registered
Weight: Not registered
Visibile in overview:
Notes:
| Symbol | Element | |
|---|---|---|
| C | Carbon | |
| Ca | Calcium | |
| O | Oxygen |