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Manganese Oxides

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LGM757468

Manganese Oxides

Ex Carl Droop, ex Dr. Otto Schmidt, Bergisch-Gladbach, Germany
With Antique Label

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Description Tabs

Description
Locality: 
Rossbach Mine, Puderbach, Neuwied, Rhineland-Palatinate, Germany
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.5 × 5 × 2.5 cm
Weight: 
16.00gr
Description

A quite lightweight piece of "Manganschaum" (manganese foam), soft, crumbly, in botryoidal and stalactitic forms.

"Manganschaum" (or wad) is a generic name for often poorly crystalline, soft manganese oxides/hydroxides, often containing significant amounts of hydroxides/oxides of other metals and adsorbed metals (Ni, Co, Cu, Fe, and other transition metals, alkali elements, etc.)

Comes with beautiful old label of Carl Adolph Droop. He was born August 28, 1841 in Raumthal, Langenfelde, Germany. Carl Droop was the proprietor of a mineral dealership in Dresden-Plauen, Germany, which he founded in 1889. The business went first by the name of "Sächsische Mineralien-Handlung Droop" as late as 1903, and later (perhaps after the death of the founder?) as "Mineralienhaus Droop."

Mineral Data
What's on the rock

Manganese Oxides

Synonym Of: 

Akhtenskite

Formula: 
ε-Mn4+O2
Strunz: 
4.DB.15b
Hardness: 
0.0

Asbolane

Formula: 
(Ni,Co)2-xMn4+(O,OH)4·nH2O
Strunz: 
4.FL.30
Hardness: 
0.0

Birnessite

Formula: 
(Na,Ca)0.5(Mn4+,Mn3+)2O4·1.5H2O
Strunz: 
4.FL.45
Hardness: 
1.5

Coronadite

Formula: 
Pb(Mn4+6Mn3+2)O16
Strunz: 
4.DK.05a
Hardness: 
4.5 - 5.0

Cryptomelane

Formula: 
K(Mn4+7Mn3+)O16
Strunz: 
4.DK.05a
Hardness: 
5.0 - 6.5

Feitknechtite

Formula: 
Mn3+O(OH)
Strunz: 
4.FE.25
Hardness: 
0.0

Groutite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.10
Hardness: 
3.5 - 4.0

Hausmannite

Formula: 
Mn2+Mn3+2O4
Strunz: 
4.BB.10
Hardness: 
5.5

Hollandite

Formula: 
Ba(Mn4+6Mn3+2)O16
Strunz: 
4.DK.05a
Hardness: 
4.0 - 6.0

Manganite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.15
Hardness: 
4.0

Psilomelane

Pyrochroite

Formula: 
Mn(OH)2
Strunz: 
4.FE.05
Hardness: 
2.5 - 3.0

Pyrolusite

Formula: 
MnO2
Strunz: 
4.DB.05
Hardness: 
2.0 - 6.5

Ramsdellite

Formula: 
Mn4+O2
Strunz: 
4.DB.15a
Hardness: 
3.0

Ranciéite

Formula: 
(Ca,Mn)Mn4O9·3H2O
Strunz: 
4.FL.40
Hardness: 
2.5 - 3.0

Romanèchite

Formula: 
(Ba,H2O)2Mn5O10
Strunz: 
4.DK.10
Hardness: 
5.0 - 6.0

Todorokite

Formula: 
(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12·3H2O
Strunz: 
4.DK.10
Hardness: 
1.5

Wad

Hardness: 
1 - 6.5

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Shipping Information

Postage Area Price
Germany (trackable & insured, up to 5 kg)
€7
EU countries (trackable)
€9
Rest of World (trackable)
€9
View sellers shipping policy

+++Important+++:
All items must be paid for prior to shipping.

The "early birds" which pay within 2 days after being invoiced are usually shipped immediately or within 1 day. All others will be shipped on the next friday or saturday after the payment was received. Delays exceeding this limit will be announced.

I offer combined shipping if more than one specimen is won and try to optimize shipping costs for you. Shipping is basically registered (I will email the tracking number to you upon request). Only for non-EU/worldwide shipping you can omit this option in order to save money - but in this case I can't take any liability if the parcel is lost. If you are interested in insurance please contact me before paying.

I have a deal with a gourmet food store nearby so I get all my packaging material (boxes) from them, thus it's free of charge for you and no additional waste is produced as elsewise it would be disposed.

Hints for estimating the shipping costs (NB: indicated net weight includes package):

0.5 and 1.0 kg parcels cannot be offered any more, unfortunately.

Up to 2 kg (tracked):

Within Germany EUR 7,00, EU Countries EUR 13,00, Switzerland and UK EUR 18,00, all others EUR 22,50.

Up to 5 kg (tracked and insured)
Within Germany EUR 7,00 EU Countries EUR 17,00, Switzerland and UK EUR 28, all others from EUR 30 to 65. Please ask for your country.

Up to 10 kg:
Please ask for your country.

In case of doubt please ask. Especially the prices of the 5 kg and 10 kg parcels depend on the destination country.

Seller Information

Payment options: offline, paypal_wpp, paypal_wps

Seller's terms and conditions

Thank you for viewing my auctions! Maintaining high standards in customer service is extremely important to me. If shipping takes longer than expected, please contact me. It is possible to file an investigation request, and during nearly ten years of e-rocks NO parcel was finally lost.

If for any reason you are not happy with any aspect of your transaction, please let me know as soon as possible, ideally within 1 week of receiving your specimen.

I will happily do all in my power to resolve the situation to your satisfaction.

+++IMPORTANT+++
Paypal is NOT accepted within Germany! I will charge a supplement of 2.5% for paypal payments within Germany. Bank transfer / offline payment is without costs and usually also completed within one day.
Within EU countries, bank transfer is also possible but not mandatory. I will offer free shipping or a discount in some cases. Please ask after receiving your invoice.

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