Calderite (original) (raw)

Formula:

Mn2+3Fe3+2(SiO4)3

Colour:

Dark reddish brown to dark yellowish, brown-yellow

Name:

Named in honor of James Calder, an early writer on the geology of India. The name calderite was first applied to a garnet-bearing rock, and later to a poorly defined massive garnet from India (Clark 1993). Dana 6th (1892) page 433 gave an analysis of the Indian mineral but it is not calderite (it only shows trace Mn). Calderite has faded from the literature and was not regarded as a valid species (Fleischer 1971, 1975), until the a manganese-iron garnet reported by Vermass (1952) from Namibia and the calderite reported from Labrador by Klein (1966) was reinvestigated by Dunn (1979). Dunn recommended revalidation of the species citing the data only from the Namibian and Canadian localities. He confirmed the Wabush calderite as being closer to end-member composition (61.5-72.8% calderite, 38.5-27.2% andradite) than those from Namibia (51% calderite, 36% grossular and 13% spessartine).

This page provides mineralogical data about Calderite.

Long-form identifier:

mindat:1:1:864:6

6ea664fe-0762-48d5-b9e2-3f750422430b

Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination

51.4.3a.6

51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination

14.18.34

14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Colour:

Dark reddish brown to dark yellowish, brown-yellow

Density:

4.05 g/cm3 (Measured) 4.07 g/cm3 (Calculated)

RI values:

n = 1.875 - 1.934

Birefringence:

Isotropic minerals have no birefringence

Comments:

Shows slight anisotropism.

Mindat Formula:

Mn2+3Fe3+2(SiO4)3

Class (H-M):

m_3_m _(_4/_m_32/m ) - Hexoctahedral

Cell Parameters:

a = 11.81 Å

Unit Cell V:

1,647.21 ų (Calculated from Unit Cell)

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0018998	Calderite	Ottonello G, Borketa M, Sciuto P F (1996) Parameterization of energy and interactions in garnets: End-member properties American Mineralogist 81 429-447		1996	Calculated structure	0	293

CIF Raw Data - click here to close

Powder Diffraction Data:

Comments:

Otjosondu, Namibia. Data from Vermaas (1952).

General Appearance of Type Material:

Place of Conservation of Type Material:

No defined type material.

Geological Setting of Type Material:

Reference:

Dunn, P.J. (1979): On the validity of calderite. Canadian Mineralogist 17, 569-571. American Mineralogist: 66: 1280.

Other Members of this group:

Associated Minerals Based on Photo Data:

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.